Volcanoes form as magma rises up from below the Earth's crust and erupts onto the surface. The type and violence of volcanic eruptions depends on factors like the amount of gas in the magma and how easily it can escape. The most common types of volcanoes are composite volcanoes, cinder cone volcanoes, and shield volcanoes, which erupt in different ways and produce different landforms. Most volcanoes occur along plate boundaries in the Pacific Ring of Fire and other convergence zones.
The document discusses the deformation of rock crust through various tectonic processes. It defines deformation as the process by which crust is deformed along plate margins, producing geologic structures like folds, faults, joints and foliation. It describes how different rock types deform under stress through either ductile or brittle deformation. The key types of deformation discussed are folding, where layers of rock are bent, and faulting, where connected blocks of rock are displaced along a fracture plane. Common fold types include anticlines, synclines and monoclines. Fault types include normal, reverse, strike-slip and oblique-slip faults.
Earth Materials and Processes : EXOGENIC PROCESSSimple ABbieC
This document discusses exogenic processes that shape the Earth's surface. It describes weathering as the breakdown of rocks at or near the surface through mechanical or chemical means. Physical weathering breaks rocks into smaller pieces through processes like freeze-thaw cycling, while chemical weathering alters rock composition through reactions with water and gases. Erosion then transports weathered materials like sand and soil through agents such as water, wind, and gravity. Mass movement involves large-scale slope movements under gravitational forces, like landslides. Together, weathering, erosion, and mass movement continuously reshape the landscape over time.
Earth Materials and Processes : ENDOGENIC PROCESSSimple ABbieC
Earth Materials and Processes : ENDOGENIC PROCESS
Content Standard:
The learners demonstrate an understanding of:
geologic processes that occur within the Earth and
the folding and faulting of rocks
Behaviors of Rocks Under Stress and PressureIVAN MON PANES
Rock structure documents tectonic movements beneath the Earth's surface that deform rocks through compression, tension, and shearing forces. Compressional forces push rock layers together, causing folding and faulting. Tensional forces pull rock layers apart, forming basins and rift valleys. Shearing forces cause vertical or horizontal displacement along faults. These tectonic forces shape the Earth's crust over geological time.
Geologic processes that shape the planet Earth, which occurs beneath the surface and associated with Interior forces. Download this so you can see some animations and some hidden images behind some pictures.
Learning objectives:
Identify the different subsystems that make up the earth
Describe the interactions that transpire in each subsystem
Diagram the subsystems that make up the earth including the interactions that transpire in each interface.
Explain that the Earth consists of four subsystems, across whose boundaries matter and energy flow
The document discusses the Earth's internal energy and how it causes tectonic plate movement and related geological phenomena. The main points are:
1) The Earth has internal heat from radioactive elements and impacts that causes plate tectonics and results in volcanoes, earthquakes, and mountain building.
2) Alfred Wegener proposed continental drift in 1912 to explain how the continents were once joined together before drifting apart, as evidenced by matching continental shelves.
3) The Earth's solid crust is made up of tectonic plates that move due to convection currents in the mantle, resulting in earthquakes and volcanic activity at plate boundaries.
This document discusses the key characteristics of Earth that are necessary to support life. It explains that Earth has liquid water, a heat source from both internal and external sources, a protective atmosphere, the right amount of energy from being located in the sun's habitable zone, a strong magnetic field, abundant nutrients circulated by geological processes and water cycles, and tectonic plates that help regulate the planet's temperature by insulating it from the Earth's hot core. These unique characteristics have made Earth habitable for billions of years and allowed life to thrive.
The document discusses the deformation of rock crust through various tectonic processes. It defines deformation as the process by which crust is deformed along plate margins, producing geologic structures like folds, faults, joints and foliation. It describes how different rock types deform under stress through either ductile or brittle deformation. The key types of deformation discussed are folding, where layers of rock are bent, and faulting, where connected blocks of rock are displaced along a fracture plane. Common fold types include anticlines, synclines and monoclines. Fault types include normal, reverse, strike-slip and oblique-slip faults.
Earth Materials and Processes : EXOGENIC PROCESSSimple ABbieC
This document discusses exogenic processes that shape the Earth's surface. It describes weathering as the breakdown of rocks at or near the surface through mechanical or chemical means. Physical weathering breaks rocks into smaller pieces through processes like freeze-thaw cycling, while chemical weathering alters rock composition through reactions with water and gases. Erosion then transports weathered materials like sand and soil through agents such as water, wind, and gravity. Mass movement involves large-scale slope movements under gravitational forces, like landslides. Together, weathering, erosion, and mass movement continuously reshape the landscape over time.
Earth Materials and Processes : ENDOGENIC PROCESSSimple ABbieC
Earth Materials and Processes : ENDOGENIC PROCESS
Content Standard:
The learners demonstrate an understanding of:
geologic processes that occur within the Earth and
the folding and faulting of rocks
Behaviors of Rocks Under Stress and PressureIVAN MON PANES
Rock structure documents tectonic movements beneath the Earth's surface that deform rocks through compression, tension, and shearing forces. Compressional forces push rock layers together, causing folding and faulting. Tensional forces pull rock layers apart, forming basins and rift valleys. Shearing forces cause vertical or horizontal displacement along faults. These tectonic forces shape the Earth's crust over geological time.
Geologic processes that shape the planet Earth, which occurs beneath the surface and associated with Interior forces. Download this so you can see some animations and some hidden images behind some pictures.
Learning objectives:
Identify the different subsystems that make up the earth
Describe the interactions that transpire in each subsystem
Diagram the subsystems that make up the earth including the interactions that transpire in each interface.
Explain that the Earth consists of four subsystems, across whose boundaries matter and energy flow
The document discusses the Earth's internal energy and how it causes tectonic plate movement and related geological phenomena. The main points are:
1) The Earth has internal heat from radioactive elements and impacts that causes plate tectonics and results in volcanoes, earthquakes, and mountain building.
2) Alfred Wegener proposed continental drift in 1912 to explain how the continents were once joined together before drifting apart, as evidenced by matching continental shelves.
3) The Earth's solid crust is made up of tectonic plates that move due to convection currents in the mantle, resulting in earthquakes and volcanic activity at plate boundaries.
This document discusses the key characteristics of Earth that are necessary to support life. It explains that Earth has liquid water, a heat source from both internal and external sources, a protective atmosphere, the right amount of energy from being located in the sun's habitable zone, a strong magnetic field, abundant nutrients circulated by geological processes and water cycles, and tectonic plates that help regulate the planet's temperature by insulating it from the Earth's hot core. These unique characteristics have made Earth habitable for billions of years and allowed life to thrive.
This document discusses different types of natural hazards including geological hazards such as earthquakes, tsunamis, landslides, and volcanic eruptions. It provides details on the impact of specific past events in the Philippines and recommends preparedness, response, and rehabilitation strategies. These include evaluating building safety, developing evacuation plans, staying away from damaged areas, and obtaining disaster information from radio after an event occurs. The goal is to minimize harm and casualties from natural hazards through preparedness before, appropriate response during, and rehabilitation after such events.
Minerals / Common Rock-forming Minerals and their Physical and Chemical Prope...Simple ABbieC
Department of Education | Senior High School
Topic: Minerals / Common Rock-forming Minerals and their Physical and Chemical Properties
Learning Competency:
Earth and Life Science: Identify common rock-forming minerals using their physical and chemical properties.
Earth Science (for STEM): Identify common rock-forming minerals using their physical and chemical properties.
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This is a powerpoint presentation that is about one of the Senior High School Core Subject: Earth and Life Science. It is composed of the theories that explains the Earth and its Subsystems (The Four Spheres).
This document discusses different types of stresses that cause rock deformation, including confining stress, compression stress, tension stress, and shear stress. It also describes different types of resulting rock features such as folds, fractures, faults, and mountains. Specifically, it compares three types of folds - monoclines, anticlines, and synclines. It also differentiates between three main types of plate boundaries: divergent boundaries which cause tension stress and normal faults, convergent boundaries which cause compression stress and reverse faults, and transform boundaries which cause shear stress and strike-slip faults. Mountains can form at convergent plate boundaries through folding and faulting of rocks.
This is a PowerPoint Presentation about Magmatism, a lesson in Earth and Life Science, First quarter for Grade 11/12 Students. This will help them understand the lesson and make them familiar with the topic.
Ore Minerals (How it is found, mined, and processed for human use)Simple ABbieC
Department of Education | Senior High School
Topic: Ore Minerals (How it is found, mined, and processed for human use)
Learning Competency:
Earth Science (for STEM): Describe how ore minerals are found, mined, and processed for human use. (S11ES-Ic-d-8)
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Scientists in the 1950s used sonar to map the mid-ocean ridge and discovered it was not flat but contained underwater mountains. This discovery led them to research what the ridge was and how it formed. Evidence from molten rock samples, magnetic stripes in the ocean crust, and the ages of rocks drilled from the ocean floor supported Harry Hess' theory from 1960 of sea-floor spreading, where new crust forms at mid-ocean ridges and spreads outward over time.
How rocks behave under different types of stressMittyMitty
This document discusses how rocks behave under different types of stress. It explains that rocks undergo deformation and strain when subjected to tensional, compressional, or shear stresses. The document outlines the different stages of rock deformation, from elastic to ductile to fracture, and factors like temperature, confining pressure, and composition that influence the deformation process. It also describes geological structures like joints, faults, folds, anticlines and synclines that form from rock deformation.
This document discusses exogenous processes on Earth. It describes how rocks undergo weathering through physical and chemical processes which break them down. The products of weathering are then eroded by forces like water, wind, and ice and transported elsewhere. Eroded materials are eventually deposited through sedimentation, accumulating at the bottom of bodies of water or other areas. Mass wasting also occurs as large slabs of rock detach and move downslope due to gravity, posing risks.
MOVEMENT OF PLATES AND FORMATION OF FOLDS AND.pptxmarionboyka
This document discusses various types of rock deformation processes including metamorphism, plate tectonics, folds, faults, and joints. It describes contact and regional metamorphism, the four main types of stresses that cause rock deformation, and plate tectonic theory including the three types of plate boundaries. The document also defines common geological structures such as anticlines, synclines, monoclines and the four basic types of folds. Finally, it explains joints, faults, and the four main fault types.
This document summarizes various coastal processes including waves, currents, tides, sea level changes, erosion, deposition, and landforms. It describes how waves, currents, and tides shape shorelines through erosion, transportation, and deposition of sediments. Key coastal landforms are discussed like spits, barrier islands, deltas, cliffs, wave-cut platforms, sea caves, sea arches, and sea stacks that form through these coastal processes. Biological activity and rising sea levels also impact coastal evolution over time.
Stratified rocks are formed from layers of sediment or volcanic material that build up over time. The layers can range significantly in thickness from millimeters to meters and come in different shapes. Examples of stratified rocks include sedimentary rocks with clear layering as well as some igneous rocks, such as granite, that form distinct layers when they cool and harden on the Earth's surface.
Exogenic processes are surface processes that wear away and sculpt the Earth's surface. The main exogenic processes are weathering, erosion, mass wasting, and sedimentation. Weathering breaks down rocks through physical, chemical, or biological means. Erosion then transports the weathered material and wears away the Earth's surface, primarily through water, glaciers, wind, or mass wasting. Mass wasting involves downslope soil and sediment movement under gravity. Sedimentation is the deposition and accumulation of eroded sediments in new locations.
Earth and Life Science - Grade 11 (Minerals)Love Ricarto
Mineralogy is the study of minerals, which are naturally occurring inorganic solids with a defined chemical composition and crystalline atomic structure. Minerals can be described as inorganic, naturally formed solids with consistent chemical compositions and ordered atomic arrangements. Key physical properties include luster, hardness, streak, cleavage, fracture, color, specific gravity, and crystal form. Minerals are important natural resources but are non-renewable, so wise use and conservation is important to ensure availability for future generations.
The document describes three endogenous processes that occur within the Earth:
Magmatism, where rocks reach high temperatures and melt to form magma, which is then pushed through the mantle by convection currents. Volcanism occurs as magma escapes through openings, erupting at the surface with extreme heat and pressure. Metamorphism is the process by which the mineral components and textures of rocks change due to increases in heat, pressure, and fluids, occurring through contact or regional metamorphism on large scales.
Planet Earth and its properties necessary to support lifeSimple ABbieC
Department of Education | Senior High School
Topic: Planet Earth and its properties necessary to support life.
Learning Competency:
Earth and Life Science: Recognize the uniqueness of Earth, being the only planet in the Solar System with properties necessary to support life.
Earth Science (for STEM): Describe the characteristics of Earth that are necessary to support life.
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The document describes two types of endogenous (internally driven) landform-building processes: igneous and tectonic processes. Igneous processes create landforms such as volcanoes through volcanic eruptions and igneous intrusions. Tectonic processes like folding, faulting, and lateral faulting form landforms including mountains, rift valleys, escarpments, and are responsible for earthquakes through ongoing tectonic activity.
This document summarizes different types of geologic hazards including earthquakes, volcanic eruptions, and landslides. It describes earthquakes as the shaking or trembling of the ground caused by displacement below the surface. Major earthquake hazards are ground shaking, ground rupture, tsunamis, liquefaction, landslides, and fires caused by gas line ruptures. Volcanic eruptions occur when pressure builds up inside a volcano, causing ash, gas and magma to be released. Associated hazards are lava flows, lahars, pyroclastic falls, volcanic gases, and tephra falls. Landslides involve the downward movement of earth materials along slopes, often caused by earthquakes or heavy rain. Specific landslide
Weathering breaks rocks down into smaller pieces through physical or chemical processes when exposed to the atmosphere and hydrosphere. Physical weathering breaks rocks without changing their chemical composition through processes like frost wedging and abrasion. Chemical weathering alters the chemical composition of rocks through oxidation, hydrolysis, and carbonation. The products of weathering accumulate as soil and are further eroded by agents such as water, wind, and ice. Erosion transports eroded material which is eventually deposited elsewhere, usually in bodies of water, based on factors like particle size, shape, density, and transport velocity.
This document discusses various geological hazards caused by earthquakes, volcanic eruptions, and landslides. It identifies the Philippines as highly prone to these hazards due to its location in the Ring of Fire. Specific hazards of each event are outlined such as ground shaking from earthquakes, pyroclastic flows from volcanic eruptions, and human activities that can trigger landslides like deforestation. The document also lists the most at-risk provinces in the Philippines for each hazard and provides safety precautions to follow during hazardous geological events.
Volcanism refers to the eruption of molten rock from within the earth onto its surface. Volcanoes form at boundaries between tectonic plates due to pressure from rising magma. The degree of explosiveness depends on factors like gas content and viscosity of the lava. Most volcanoes occur along plate boundaries in the Pacific Ring of Fire. Common types include composite volcanoes, shield volcanoes, and cinder cones, which erupt in styles ranging from gentle to extremely violent.
This document discusses key aspects of volcanism including:
- Volcanoes form due to movement of tectonic plates and magma rising from below Earth's surface.
- Most volcanoes occur at plate boundaries like divergent and convergent margins.
- The degree of violence in a volcanic eruption depends on factors like the gas content and viscosity of the magma as well as the silica content which determines eruption style.
- There are several types of volcanoes that differ in size and eruption type including composite, cinder cone, and shield volcanoes.
This document discusses different types of natural hazards including geological hazards such as earthquakes, tsunamis, landslides, and volcanic eruptions. It provides details on the impact of specific past events in the Philippines and recommends preparedness, response, and rehabilitation strategies. These include evaluating building safety, developing evacuation plans, staying away from damaged areas, and obtaining disaster information from radio after an event occurs. The goal is to minimize harm and casualties from natural hazards through preparedness before, appropriate response during, and rehabilitation after such events.
Minerals / Common Rock-forming Minerals and their Physical and Chemical Prope...Simple ABbieC
Department of Education | Senior High School
Topic: Minerals / Common Rock-forming Minerals and their Physical and Chemical Properties
Learning Competency:
Earth and Life Science: Identify common rock-forming minerals using their physical and chemical properties.
Earth Science (for STEM): Identify common rock-forming minerals using their physical and chemical properties.
Please LIKE / FOLLOW and SHARE my other social media accounts.
Facebook: https://www.facebook.com/Simple-ABbieC-131584525051378/
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This is a powerpoint presentation that is about one of the Senior High School Core Subject: Earth and Life Science. It is composed of the theories that explains the Earth and its Subsystems (The Four Spheres).
This document discusses different types of stresses that cause rock deformation, including confining stress, compression stress, tension stress, and shear stress. It also describes different types of resulting rock features such as folds, fractures, faults, and mountains. Specifically, it compares three types of folds - monoclines, anticlines, and synclines. It also differentiates between three main types of plate boundaries: divergent boundaries which cause tension stress and normal faults, convergent boundaries which cause compression stress and reverse faults, and transform boundaries which cause shear stress and strike-slip faults. Mountains can form at convergent plate boundaries through folding and faulting of rocks.
This is a PowerPoint Presentation about Magmatism, a lesson in Earth and Life Science, First quarter for Grade 11/12 Students. This will help them understand the lesson and make them familiar with the topic.
Ore Minerals (How it is found, mined, and processed for human use)Simple ABbieC
Department of Education | Senior High School
Topic: Ore Minerals (How it is found, mined, and processed for human use)
Learning Competency:
Earth Science (for STEM): Describe how ore minerals are found, mined, and processed for human use. (S11ES-Ic-d-8)
Please LIKE / FOLLOW and SHARE my other social media accounts.
Facebook: https://www.facebook.com/Simple-ABbieC-131584525051378/
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Scientists in the 1950s used sonar to map the mid-ocean ridge and discovered it was not flat but contained underwater mountains. This discovery led them to research what the ridge was and how it formed. Evidence from molten rock samples, magnetic stripes in the ocean crust, and the ages of rocks drilled from the ocean floor supported Harry Hess' theory from 1960 of sea-floor spreading, where new crust forms at mid-ocean ridges and spreads outward over time.
How rocks behave under different types of stressMittyMitty
This document discusses how rocks behave under different types of stress. It explains that rocks undergo deformation and strain when subjected to tensional, compressional, or shear stresses. The document outlines the different stages of rock deformation, from elastic to ductile to fracture, and factors like temperature, confining pressure, and composition that influence the deformation process. It also describes geological structures like joints, faults, folds, anticlines and synclines that form from rock deformation.
This document discusses exogenous processes on Earth. It describes how rocks undergo weathering through physical and chemical processes which break them down. The products of weathering are then eroded by forces like water, wind, and ice and transported elsewhere. Eroded materials are eventually deposited through sedimentation, accumulating at the bottom of bodies of water or other areas. Mass wasting also occurs as large slabs of rock detach and move downslope due to gravity, posing risks.
MOVEMENT OF PLATES AND FORMATION OF FOLDS AND.pptxmarionboyka
This document discusses various types of rock deformation processes including metamorphism, plate tectonics, folds, faults, and joints. It describes contact and regional metamorphism, the four main types of stresses that cause rock deformation, and plate tectonic theory including the three types of plate boundaries. The document also defines common geological structures such as anticlines, synclines, monoclines and the four basic types of folds. Finally, it explains joints, faults, and the four main fault types.
This document summarizes various coastal processes including waves, currents, tides, sea level changes, erosion, deposition, and landforms. It describes how waves, currents, and tides shape shorelines through erosion, transportation, and deposition of sediments. Key coastal landforms are discussed like spits, barrier islands, deltas, cliffs, wave-cut platforms, sea caves, sea arches, and sea stacks that form through these coastal processes. Biological activity and rising sea levels also impact coastal evolution over time.
Stratified rocks are formed from layers of sediment or volcanic material that build up over time. The layers can range significantly in thickness from millimeters to meters and come in different shapes. Examples of stratified rocks include sedimentary rocks with clear layering as well as some igneous rocks, such as granite, that form distinct layers when they cool and harden on the Earth's surface.
Exogenic processes are surface processes that wear away and sculpt the Earth's surface. The main exogenic processes are weathering, erosion, mass wasting, and sedimentation. Weathering breaks down rocks through physical, chemical, or biological means. Erosion then transports the weathered material and wears away the Earth's surface, primarily through water, glaciers, wind, or mass wasting. Mass wasting involves downslope soil and sediment movement under gravity. Sedimentation is the deposition and accumulation of eroded sediments in new locations.
Earth and Life Science - Grade 11 (Minerals)Love Ricarto
Mineralogy is the study of minerals, which are naturally occurring inorganic solids with a defined chemical composition and crystalline atomic structure. Minerals can be described as inorganic, naturally formed solids with consistent chemical compositions and ordered atomic arrangements. Key physical properties include luster, hardness, streak, cleavage, fracture, color, specific gravity, and crystal form. Minerals are important natural resources but are non-renewable, so wise use and conservation is important to ensure availability for future generations.
The document describes three endogenous processes that occur within the Earth:
Magmatism, where rocks reach high temperatures and melt to form magma, which is then pushed through the mantle by convection currents. Volcanism occurs as magma escapes through openings, erupting at the surface with extreme heat and pressure. Metamorphism is the process by which the mineral components and textures of rocks change due to increases in heat, pressure, and fluids, occurring through contact or regional metamorphism on large scales.
Planet Earth and its properties necessary to support lifeSimple ABbieC
Department of Education | Senior High School
Topic: Planet Earth and its properties necessary to support life.
Learning Competency:
Earth and Life Science: Recognize the uniqueness of Earth, being the only planet in the Solar System with properties necessary to support life.
Earth Science (for STEM): Describe the characteristics of Earth that are necessary to support life.
Please LIKE / FOLLOW and SHARE my other social media accounts.
Facebook: https://www.facebook.com/Simple-ABbieC-131584525051378/
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The document describes two types of endogenous (internally driven) landform-building processes: igneous and tectonic processes. Igneous processes create landforms such as volcanoes through volcanic eruptions and igneous intrusions. Tectonic processes like folding, faulting, and lateral faulting form landforms including mountains, rift valleys, escarpments, and are responsible for earthquakes through ongoing tectonic activity.
This document summarizes different types of geologic hazards including earthquakes, volcanic eruptions, and landslides. It describes earthquakes as the shaking or trembling of the ground caused by displacement below the surface. Major earthquake hazards are ground shaking, ground rupture, tsunamis, liquefaction, landslides, and fires caused by gas line ruptures. Volcanic eruptions occur when pressure builds up inside a volcano, causing ash, gas and magma to be released. Associated hazards are lava flows, lahars, pyroclastic falls, volcanic gases, and tephra falls. Landslides involve the downward movement of earth materials along slopes, often caused by earthquakes or heavy rain. Specific landslide
Weathering breaks rocks down into smaller pieces through physical or chemical processes when exposed to the atmosphere and hydrosphere. Physical weathering breaks rocks without changing their chemical composition through processes like frost wedging and abrasion. Chemical weathering alters the chemical composition of rocks through oxidation, hydrolysis, and carbonation. The products of weathering accumulate as soil and are further eroded by agents such as water, wind, and ice. Erosion transports eroded material which is eventually deposited elsewhere, usually in bodies of water, based on factors like particle size, shape, density, and transport velocity.
This document discusses various geological hazards caused by earthquakes, volcanic eruptions, and landslides. It identifies the Philippines as highly prone to these hazards due to its location in the Ring of Fire. Specific hazards of each event are outlined such as ground shaking from earthquakes, pyroclastic flows from volcanic eruptions, and human activities that can trigger landslides like deforestation. The document also lists the most at-risk provinces in the Philippines for each hazard and provides safety precautions to follow during hazardous geological events.
Volcanism refers to the eruption of molten rock from within the earth onto its surface. Volcanoes form at boundaries between tectonic plates due to pressure from rising magma. The degree of explosiveness depends on factors like gas content and viscosity of the lava. Most volcanoes occur along plate boundaries in the Pacific Ring of Fire. Common types include composite volcanoes, shield volcanoes, and cinder cones, which erupt in styles ranging from gentle to extremely violent.
This document discusses key aspects of volcanism including:
- Volcanoes form due to movement of tectonic plates and magma rising from below Earth's surface.
- Most volcanoes occur at plate boundaries like divergent and convergent margins.
- The degree of violence in a volcanic eruption depends on factors like the gas content and viscosity of the magma as well as the silica content which determines eruption style.
- There are several types of volcanoes that differ in size and eruption type including composite, cinder cone, and shield volcanoes.
This document summarizes different types of volcanoes based on their activity, location, structure, and explosiveness. Volcanoes are classified as active, dormant, or extinct based on their recent eruptive history. Additional classifications include the volcano's shape as a shield cone, cinder cone, or composite/stratovolcano. Stratovocanoes are tall and cone-shaped volcanoes formed from layers of erupted materials. The document also provides examples of notable volcanoes that fit different classifications.
The document provides information about volcanoes and earthquakes. It defines key terms like volcano, magma, lava, caldera, and describes different types of volcanoes like shield volcanoes, composite volcanoes, and cinder cone volcanoes. It also discusses what causes volcanic activity and describes different types of volcanic eruptions. The document then covers earthquakes, defining terms like focus and epicenter, and describing how seismic waves and intensity scales are used to measure earthquakes.
Volcanoes are openings in the earth's crust that allow magma, hot lava, volcanic ash, and gases to escape from below the surface. The earth's crust is broken into tectonic plates that move and occasionally cause pressure to build under the surface, resulting in volcanic eruptions when the pressure is released. There are three main types of volcanoes: composite volcanoes, shield volcanoes, and dome volcanoes, which erupt in different ways depending on the viscosity of the lava. Several active volcanoes in the Philippines are discussed, including Mayon Volcano, Taal Volcano, and Kanlaon Volcano. Volcanic eruptions can have both positive and negative environmental impacts
The document provides an overview of volcanism and the study of volcanoes (volcanology). It discusses the motivation for studying volcanoes, early perceptions and theories about volcanoes, how volcanoes work including the magma system and role of plate tectonics, what magma is and how it is generated, and how volcanologists study volcanoes to better understand volcanic processes and predict eruptions.
The document provides information about different types of volcanoes and volcanic features including:
- Shield volcanoes which are built by basalt lava flows and have gentle slopes.
- Lava domes which are built by thick, viscous lava that cools too quickly to flow very far from the eruption.
- Cinder cones which are steep sided hills made of volcanic fragments blown from eruptions of stratovolcanoes.
- Stratovolcanoes which have steep sides and are formed by violent eruptions of lava flows, tephra, and pyroclastic flows from multiple vents.
- Mud volcanoes which form from eruptions of wet
This document summarizes information about volcanoes. It defines a volcano as a rupture in the Earth's crust that allows hot lava, ash, and gases to escape from below the surface. Volcanoes form over time as a result of magma rising through cracks and releasing pressure during volcanic eruptions, which cool to form new crust. Characteristics of volcanoes include their cone shape and the lava and ash produced during eruptions. Volcanic hazards pose risks and can include lava flows, explosions, toxic gases, ash falls, pyroclastic flows, and mudflows. Volcano forecasts rely on studying past eruptions to estimate potential hazards, and monitoring for earthquake activity and surface deformation to provide useful warnings of
This document discusses volcanoes and volcanic eruptions. It begins by defining vulcanism as the eruption of magma onto the earth's surface through a vent. It then describes the anatomy of volcanoes and how they are formed from magma rising from the earth's mantle. The document outlines different tectonic settings for volcanoes and the typical magma and eruption types associated with each setting. It discusses the mechanics and styles of volcanic eruptions including phreatic, phreatomagmatic, Strombolian, Vulcanian and Plinian eruptions. Finally, it notes some constructive aspects of volcanism such as providing nutrients to soil and potential for geothermal energy.
Volcanoes form when magma rises from below the Earth's crust and erupts onto the surface. There are three main types of volcanoes: shield volcanoes which have gentle slopes and non-explosive eruptions, composite volcanoes which have steep slopes and more explosive eruptions, and super volcanoes which have massive eruptions over 1,000 cubic km. Volcanic eruptions can have both positive impacts such as fertilizing soils and negative impacts like killing people and damaging property. Scientists monitor volcanoes using techniques like seismometers and tilt meters to predict eruptions.
Volcanoes form at locations where magma reaches the Earth's surface. There are three main types of volcanoes classified based on their composition and eruption style. Composite volcanoes like Mayon Volcano are tall and steep due to explosive eruptions of thick, andesitic magma. Shield volcanoes like those in Hawaii erupt basalt quietly as low-viscosity lava flows great distances. Cinder cones are small and formed from accumulated ejecta from Strombolian eruptions. A volcano's anatomy includes features like the vent, lava domes, and pyroclastic flows that can have hazardous impacts.
Volcanoes form as magma rises from below the Earth's surface due to movement of tectonic plates. There are three main types of volcanoes - shield volcanoes which erupt fluid lava to form broad, low cones; cinder cone volcanoes which form steep slopes of pyroclastic fragments; and composite or stratovolcanoes which are tall cones built up of hardened lava and ash. Examples include Hawaii's shield volcanoes Kilauea and Mauna Loa, Mexico's Paricutin cinder cone volcano, and the Philippines' composite Mayon volcano. Volcanic eruptions can negatively impact human health through ash, gases and dust inhalation leading to respiratory and other illnesses.
This document provides an overview of volcanism, including definitions of key terms like volcano and volcanic eruption. It describes the three main types of volcanoes as composite volcanoes, cinder cone volcanoes, and shield volcanoes. The document also discusses the origin and structure of volcanoes, explaining that magma and gases cause eruptions. It outlines the three categories of volcanoes based on eruption frequency and gives examples. Areas of common volcanism are identified as subducting plate boundaries and mid-ocean ridges.
Volcanoes form when magma rises up from underground chambers and erupts through vents in the Earth's crust. They are mountains or hills formed by accumulated lava and volcanic debris. The Philippines has many active volcanoes located along the Pacific Ring of Fire, including Mayon Volcano, Taal Volcano, Kanlaon Volcano, and Bulusan Volcano - the most active in the country. Volcanic activity can sometimes be predicted by signs like steaming, ground swelling, and increased earthquake frequency and intensity.
There are several main types of volcanoes classified based on their shape, eruptive behavior, and composition. Composite volcanoes, also known as stratovolcanoes, are conical mountains built up by viscous lava flows and explosive eruptions, examples being Mount St. Helens and Mount Pinatubo. Shield volcanoes are larger and less steeply sloped, constructed by fluid basaltic lava flows like those of Hawaii. Small cinder cones form from explosive eruptions of pyroclastic material. Fissure eruptions produce fluid lava flows from cracks in the crust along zones of weakness.
what are Volcanism and volcano,
Distribution of Volcanoes
Kinds of Volcanoes
Types of Volcanic Hazards
Preparing for Volcanic Emergencies
A volcano is generally a conical shaped hill or mountain built by accumulations of lava flows, tephra, and volcanic ash. About 95% of active volcanoes occur at the plate subduction zones and at the mid-oceanic ridges. The other 5% occur in areas associated with lithospheric hot spots. These hot spots have no direct relationships with areas of crustal creation or subduction zones. It is believed that hot spots are caused by plumes of rising magma that have their origin within the asthenosphere.
Over the last 2 million years, volcanoes have been depositing lava, tephra, and ash in particular areas of the globe. These areas occur at hot spots, rift zones, and along plate boundaries where tectonic subduction is taking place within the asthenosphere.
The most prevalent kinds of volcanoes on the Earth's surface are the kind which form the "Pacific Rim of Fire". Those are volcanoes which form as a result of subduction of the nearby lithosphere.
DETAILS ABOUT VOLCANP. POWER POINT PRESENTATIONjhenzelkeot
This document defines key terms and concepts related to volcanoes, including:
- Parts of a volcano include the summit, slopes, and base. Other features are the magma chamber, main vent, conduit, and side vents.
- Volcanoes are classified based on activity as active, inactive, or potentially active. They are also classified based on structure as cinder cone, composite/strato, or shield volcanoes.
- Eruption types include phreatic, phreatomagmatic, strombolian, vulcanian, and plinian.
- Magma composition is determined by factors like silica and volatile content, temperature, and viscosity.
- The erup
Volcanoes form at plate boundaries where tectonic plates are diverging or converging. There are three main types of volcanoes based on location: shield volcanoes at divergent boundaries, stratovolcanoes at subduction zones, and hotspots formed by mantle plumes. Volcanoes pose hazards from lava flows, explosions, and ashfall. Classification systems describe volcanoes based on activity levels from dormant to active. Monitoring systems use alert levels and colors to communicate volcanic unrest and eruptions.
This document classifies and describes the different types of volcanoes. It discusses 7 main types: fissure volcanoes which erupt from cracks without a central crater; composite volcanoes which are tall and symmetrical with layers of lava and ash like Mount Fuji; shield volcanoes which are broad with low slopes like those in Hawaii; cinder cones which are steep-sided hills formed from pyroclastic debris; lava domes which form bulbous masses that pile around vents; supervolcanoes which are extremely large and dangerous, capable of global cooling like Yellowstone Caldera; and submarine volcanoes which are common on ocean floors, often forming pillow lava and hydrothermal vents.
Volcanoes form when magma rises from below the Earth's surface. There are two main types of volcanoes: shield volcanoes and stratovolcanoes. Shield volcanoes are wide and gently sloping due to fluid lava flows, while stratovolcanoes are steep and tall with layers of hardened lava and ash. The viscosity of magma depends on its temperature, composition, and gas content, and determines the type of eruption from a volcano. Active volcanoes are currently erupting or have erupted in the last 10,000 years, while dormant and extinct volcanoes have not erupted recently or in over 10,000 years respectively.
Introduction to Empowerment Technology.pptxJerome Bigael
Introduction to Empowerment Technology.
What is ICT?
What is information and Communication Technology?
Status if ICT in the Philippines
Importance of ICT in the Philippine society
Desk Calendar planner 2023 pdf
Monthly Planner Template helps you visually track and space out deadlines and to-do's for people and teams. Easily plan out your day, week, or month!
The different common minerals and their uses.Jerome Bigael
This document discusses common minerals and their uses. It lists various rock-forming minerals and describes their main applications. Aggregates such as sand and gravel are used to make concrete and asphalt. Aluminum is used in automobiles, airplanes, bottling and canning. Other minerals and their major uses include: copper for wiring and electronics; gold for jewelry, dentistry and electronics; granite for buildings and construction; gypsum for plaster and wallboard; iron ore for steel production; quartz for instruments and glass; sandstone for buildings and construction; silver for photography, jewelry and electronics; and tin for cans and containers.
This document provides an overview of the mining process from exploration to extraction and processing to reclamation. It explains that exploration uses tools like satellites, planes and helicopters to identify mineral deposits, and involves geological mapping and sampling. Once an area looks promising, drilling extracts core samples for analysis. It also discusses environmental studies, career opportunities mining provides to local communities, the two main types of mining (surface and underground), extraction methods like drilling and blasting, processing techniques such as milling, concentration, smelting, and leaching, and modern reclamation practices to restore mined land.
This document discusses rock-forming minerals and mineral resources. It defines minerals as naturally occurring inorganic solids with crystalline structures and fixed or varying chemical compositions. Minerals are the building blocks of rocks and undergo geological processes to form rocks. Some rocks contain useful mineral resources like metals that are extracted. Metallic mineral resources include ferrous minerals like iron ore and non-ferrous minerals like gold and copper. Non-metallic mineral resources like coal, clay and salt are associated with sedimentary rocks. Examples of common rock-forming minerals discussed are quartz, pyrite and talc.
Plate tectonics shapes the Earth's surface through the movement of tectonic plates driven by mantle convection in Earth's interior. The geosphere consists of a thin crust overlaying a thick mantle made up of solid rock that makes up 84% of Earth's volume and lies between the core and crust. The mantle and core are separated by discontinuities discovered by scientists like Mohorovicic and Lehmann.
The hydrosphere refers to all water on Earth, including water in the hydrological cycle that circulates between oceans, atmosphere, and land via evaporation, condensation and precipitation. Only a small percentage of 2.5% of Earth's total water is freshwater, with most found as surface water or groundwater stored in aquifers underground between rock and soil particles.
The biosphere encompasses all living things on Earth and the areas that can support life. It includes land, water, and air and all living things within those areas. The biosphere interacts with the lithosphere, hydrosphere, and atmosphere.
1. The document discusses the water cycle and identifies the key processes as condensation, precipitation, evaporation, transpiration, infiltration, and surface run-off.
2. It also discusses the composition of the atmosphere, noting it is composed of 78% nitrogen, 21% oxygen, 0.9% argon, and trace amounts of other gases. Atmospheric circulation plays an important role in redistributing heat across the Earth's surface.
3. The layers of the atmosphere are identified as the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Details are provided about each layer, including their composition and characteristics.
Theories on the origin of the Universe.Jerome Bigael
The document describes several historical theories on the origin and structure of the universe from ancient times through the 20th century. These include: the Hindu cyclical universe theory; the Greek theories of a primordial mixture and atomic universes; the geocentric Aristotelian and Ptolemaic universes; the heliocentric theories of Aristarchus and Copernicus; Newton's static universe; the nebular hypothesis; Einstein's static universe; and the modern Big Bang theory formulated by Lemaitre that the universe began in a hot, dense state around 13.7 billion years ago.
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The document discusses theories on the origin of the solar system. It begins by describing the basic composition of the solar system, including stars, planets, natural satellites, comets, asteroids, and the interplanetary medium. It then discusses several theories for how the solar system formed, including:
- The nebular hypothesis proposed in the 1700s that a rotating gaseous cloud contracted to form the sun and planets from the surrounding disc. However, it did not fully explain the distribution of angular momentum.
- Encounter hypotheses proposed interactions between stars caused matter to be drawn off and form planets, but cannot explain the different ages of the sun and planets.
- The currently accepted protoplanet
Astronomy and the invention of TelescopeJerome Bigael
Before telescopes, ancient civilizations observed astronomical phenomena like star clusters and used constellations for agriculture and navigation. The Greeks developed geocentric models to mathematically describe planetary motions, prioritizing mathematical accuracy over physical reality. In the early 1600s, Hans Lippershey invented the telescope and Galileo was the first to use it for astronomy, discovering lunar craters, Jupiter's moons, Venusian phases, and sunspots, challenging existing paradigms.
This document defines and explains key concepts in kinematics including speed, velocity, and acceleration. It provides the following definitions:
- Speed is a measure of how fast a body moves and is a scalar quantity. There are two types - average and instantaneous speed.
- Velocity is a measure of both speed and direction of motion, making it a vector quantity. Average and instantaneous velocity are also defined.
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This document defines and discusses key concepts related to motion, including reference points, distance, displacement, scalar and vector quantities. It notes that motion depends on the choice of reference point. Distance is the length of the path traveled between two positions, while displacement is a vector quantity referring to the straight line distance between two positions. Scalar quantities only have magnitude, while vector quantities have both magnitude and direction. Examples of each are provided.
The document discusses early models of the universe including the ideas that the Earth was flat and then spherical. It describes models from Greek philosophers like Aristotle who believed the Earth was at the center of the universe and surrounded by spheres carrying the planets and stars. Later models from Copernicus, Brahe and Kepler placed the Sun at the center with Earth and other planets orbiting around it, moving astronomy toward a heliocentric understanding of the solar system.
Disaster, Hazard, Types of Hazard (Natural and Man Made Hazards), and Vulnera...Jerome Bigael
This document defines key concepts related to disasters, including the definitions of "disaster" provided by the UNISDR and WHO. It discusses how disasters cause multidimensional impacts by disrupting communities and exceeding local response capacity. Disasters result from the combination of exposure to hazards, existing vulnerabilities, and insufficient coping capacity. The document outlines the three main types of hazards - natural, human-made, and socio-natural. It also defines and provides examples of vulnerability at different levels - physical/material, social/organizational, and attitudinal/motivational. The most vulnerable sectors are identified as farmers, urban poor, laborers, indigenous people, persons with disabilities, women, and children.
This document discusses various earth processes including weathering, mass wasting, and soil erosion. It defines weathering as the breakdown of rocks near the earth's surface due to elements like temperature, rainfall, and frost. Weathering occurs through physical processes like exfoliation or chemical processes like oxidation. Mass wasting is the downward movement of rock and soil under gravity, and includes different types of movement like falls, slides, and flows. Soil erosion is the removal of soil faster than its replacement, and can occur through various agents like wind, water, or human activities.
This document discusses the key biomolecules found in living things: carbohydrates, lipids, proteins, and nucleic acids. It explains that carbohydrates like sugars, starches, and cellulose are used for energy storage and as structural components. Lipids such as fats and oils store energy and make up cell membranes. Proteins have many functions like structure, movement, defense, and catalysis as enzymes. Nucleic acids DNA and RNA carry genetic information and enable inheritance and protein synthesis. The four main biomolecules all contain the elements carbon, hydrogen, oxygen, and nitrogen arranged into larger structures that allow life.
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𝐃𝐢𝐬𝐜𝐮𝐬𝐬 𝐭𝐡𝐞 𝐄𝐏𝐏 𝐂𝐮𝐫𝐫𝐢𝐜𝐮𝐥𝐮𝐦 𝐢𝐧 𝐭𝐡𝐞 𝐏𝐡𝐢𝐥𝐢𝐩𝐩𝐢𝐧𝐞𝐬:
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𝐄𝐱𝐩𝐥𝐚𝐢𝐧 𝐭𝐡𝐞 𝐍𝐚𝐭𝐮𝐫𝐞 𝐚𝐧𝐝 𝐒𝐜𝐨𝐩𝐞 𝐨𝐟 𝐚𝐧 𝐄𝐧𝐭𝐫𝐞𝐩𝐫𝐞𝐧𝐞𝐮𝐫:
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This document provides an overview of wound healing, its functions, stages, mechanisms, factors affecting it, and complications.
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Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
2. Albert Garcia’s award-winning
photo taken on June 15, 1991 was
chosen by Time as one of the
“Greatest Images of the 20th
Century” and also by the
National Geographic Magazine
as one of “100 Best Pictures” of
the 20th Century. Garcia is
currently the photo editor of
Manila Bulletin.
Catastrophic
http://www.balita.com/mt-pinatubo20-photo-
exhibit-more-than-just-pictures-it-was-a-
reunion-of-survivors-2/
2
VOLCANISM: Its Features
3. VOLCANISM?
Volcanism is the eruption of molten rock (magma) onto the
surface of a planet. A volcano is the vent through which magma
and gases are discharged. Magma that reaches the surface is
called lava. Volcanos are named for Vulcan the Roman god of
fire!
4
VOLCANISM: Its Features
4. 6
How do volcanoes form?
What causes volcanoes to erupt?
Where do most volcanoes occur?
What are the different types of volcanoes?
What determines the degree of violence associated
with volcanic activity?
VOLCANISM: Its Features
5. Definition of terms
A volcano is a vent or opening
on planet’s surface which allows
molten rock called
magma, volcanic ash and gas to
escape out onto its surface. A
volcano gives a look like a
mountain from which lava
erupts. The hot magma erupting
from a volcano is called lava.
ERUPTION
Definition of Terms
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VOLCANISM: Its Features
6. Most volcanoes are formed by the movement of tectonic plates on the
surface of the earth. These plates are basically huge pieces of rock that ‘float’
on the mantle (a layer of the earth that is sort-of liquid rock).
ERUPTION
How Volcanoes Form
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TECTONIC
PLATES
8
VOLCANISM: Its Features
7. ERUPTION
Origin of Volcanoes
1. Magma rises
2. As the magma rises it melts gaps in the
surrounding rock
3. As more magma rises a large reservoir
4. Pressure from the surrounding rock causes the
magma to blast
5. The magma, now called lava,
builds up at the vent forming a
volcano.
6. Often the volcano sides will be
higher than the vent forming a
depression called a crater
9
VOLCANISM: Its Features
8. ERUPTION
What Causes Volcanoes to Erupt?
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TECTONIC PLATES
AND SETTINGS
Subducting Plate Margins
Spreading Plate Margins
Intraplate
(Hotspot)
10
VOLCANISM: Its Features
9. Again, it’s in the edge of
TECTONIC PLATES.
ERUPTION
Areas Where Most Volcanoes Occur
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11
VOLCANISM: Its Features
10. The Pacific Ring of Fire
ERUPTION
Areas Where Most Volcanoes Occur
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63/2/149/F2.large.jpg
-It is a string of volcanoes and
sites of seismic activity around
the edges of the Pacific Ocean.
-It isn’t quite a circular ring. It
is shaped more like a 40,000-
kilometer (25,000-
mile) horseshoe.
-A string of 452 volcanoes.
12
VOLCANISM: Its Features
11. ERUPTION
What determines the degree of violence associated
with volcanic activity?
Magma – molten rock or liquid that is mostly silica
Lava – solidified magma
Pyroclasts – from the Greek pyro, “fire”, and clast “broken”
– rock fragments (pyroclastic debris is also called tephra)
Lava flows – fissures in the ground
Extrusive rock - surface rock resulting from volcanic activity (rock
formed by solidification of lava)
13
VOLCANISM: Its Features
12. ERUPTION!
What determines the degree of violence associated
with volcanic activity?
Crater – funnel shaped pit at the
top of a volcano. formed when
material is blown out of the
volcano by explosions
Caldera – when the volcano
collapses due to an empty
magma chamber
CRATER
CALDERA
14
VOLCANISM: Its Features
13. ERUPTION!
What determines the degree of violence associated
with volcanic activity?
DEVELOPMENT
OF A CRATER
LAKE
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8.jpg
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VOLCANISM: Its Features
14. ERUPTION!
What determines the degree of violence associated
with volcanic activity?
Whether eruptions are very explosive or
relatively "quiet" is largely determined by two
factors:
(1) the amount of gas in the lava or magma
(2) the ease or difficulty with which the gas
can escape to the atmosphere
Viscosity – resistance to flow
PHYSICAL
CHARACTERISTICS
OF LAVA
16
VOLCANISM: Its Features
15. ERUPTION!
What determines the degree of violence associated
with volcanic activity?
Felsic
Contains more than
65% Silica
TYPES OF LAVA
Mafic
Silica (Poor) (45-52%)
RholiteBasaltAndesite
Intermediate
Silica
Composition
(53-65%)
17
VOLCANISM: Its Features
16. The two most
important factors that
influence viscosity are
the
(1) temperature of the
lava relative to the
cooler temperature
which it solidifies
(2) the silica (Si𝑂2
content of the lava)
ERUPTION!
What determines the degree of violence associated
with volcanic activity?
18
VOLCANISM: Its Features
17. ERUPTION!
Composite volcanoes
often form the largest
and tallest volcanoes.
They are the most
explosive and dangerous
of the types of volcanoes.
Types of Volcano
Composite
Volcanoes
Mt. Saint Helens in Washington state.
19
18. ERUPTION!
Usually smaller in size
than composite
volcanoes, and the
eruptions are smaller
also. They form into steep
cone shaped hills.
Types of Volcano
Cinder Cone
Volcanoes
Paricutin in Mexico
20
19. ERUPTION!
Shield volcanoes do not
erupt or explode like
composite or cinder cone
volcanoes. Shield
volcanoes have much
smaller eruptions
producing less ash.
Types of Volcano
Shield
Volcanoes
Muana Loa in Hawaii.
21
20. ERUPTION!
Pyroclastic flow descending Mayon volcano, Philippines.
-Most of the gas released during
eruption is water vapor
-Carbon dioxide, sulfur dioxide,
hydrogen sulfide, and hydrochloric acid,
are given off in lesser amounts
-Surface water introduced into a
volcanic system can greatly increase the
explositivity of an eruption.
-At high altitudes, the pyroclastics often spread out into a dark, mushroom cloud. The fine
particles are transported downwind by high atmosphere winds. Eventually debris settles
back to earth under gravity's influence as ashfall (or sometimes pumicefili) deposits.
A pyroclastic flow is a mixture of gas and pyroclastic debris that is so dense that it hugs the
ground as it flows rapidly into low areas.
Gases and Pyroclastics
2
VOLCANISM: Its Features
21. ERUPTION!
Types of Volcanic Eruptions
In a Hawaiian eruption, fluid lava is ejected from a
vent as fire fountains or lava flows. The 1969 eruption
at Mauna Ulu, a vent of Kilauea Volcano in Hawaii,
was a spectacular example of fire fountaining. Photo
by D.A. Swanson, USGS, August 22, 1969.
Hawaiian Eruption
2
VOLCANISM: Its Features
22. ERUPTION!
Types of Volcanic Eruptions
Short bursts of glowing lava,
created from the bursting of
large gas bubbles at the
summit vent of a volcano typify
a Strombolian eruption. This
photo, taken from the summit
of Stromboli, a volcano in the
Aeolian Islands, Italy, shows a
classic example of this activity.
Photo by Andrew Hague,
Istockphoto.com.
Strombolian Eruption
22
VOLCANISM: Its Features
23. ERUPTION!
Types of Volcanic Eruptions
Relatively small but violent
explosions of viscous lava create
columns of ash and gas and
occasional pyroclastic flows, as
seen at this eruption of the
Santiaguito volcanic dome
complex in Guatemala. Photo by
Jessica Ball, March 15, 2009.
Vulcanian
Eruption
23
VOLCANISM: Its Features
24. ERUPTION!
Types of Volcanic Eruptions
The largest and most violent of all explosive
eruptions, Plinian eruptions send columns of
pulverized rock, ash, and gases that rise miles
into the atmosphere in a matter of minutes.
Mount St. Helens in Washington State
experienced a Plinian eruption following a major
flank collapse in 1980. Photo by Austin Post,
USGS, May 18, 1980.
Plinian Eruption
24
VOLCANISM: Its Features
25. ERUPTION!
Types of Volcanic Eruptions
Lava domes, such as this example in
the crater of Mount St. Helens, are
piles of viscous lava that are too cool
and sticky to flow far. Domes grow and
collapse in cycles, and often form at
volcanoes that also experience Plinian
eruptions. Photo by Lyn Topinka,
USGS, August 12, 1985.
Lava Dome
25
VOLCANISM: Its Features
26. ERUPTION!
Types of Volcanic Eruptions
Lava erupting through water
creates the dramatic plumes
of scoria and billowing ash-
and-gas clouds of a
Surtseyan eruption. The type
example of this eruption
occurred at Surtsey, a
volcanic island off the coast
of Iceland. NOAA image of
the 1963 eruption.
Surtseyan Eruption
26
VOLCANISM: Its Features
27. ERUPTION!
Types of Lava Flow
A smooth and continuous
lava crust. Pahoehoe forms
when the effusion rate is
low and consequently the
velocity of lava flow is slow.
Pahoehoe lava flow is
usually at least 10 times
slower than typical aa lava
flow.
Pahoehoe
27
VOLCANISM: Its Features
28. ERUPTION!
Types of Lava Flow
Aa lava is a rough rubbly
crust of a lava flow. It is a
major lava flow type.
Aa
28
VOLCANISM: Its Features
29. ERUPTION!
Types of Lava Flow
A distinctive lava flow morphology
that has been appearing in our
dredges is pillow lava. Pillow lavas
form when hot lava flows into water
and cools rapidly, creating long
tubes and bulbous pillow-shaped
mounds of rock. Pillow lavas are
found not only in the ocean but
also under glaciers that overlie
volcanoes.
Pillow Lava
29
VOLCANISM: Its Features
30. ERUPTION!
Types of Lava Flow
Blocky flows are
common if the silica
content of lavas is
higher (composition
of basaltic andesite to
rhyolite).
Blocky
30
VOLCANISM: Its Features
31. ERUPTION!
Three Definitions of Volcanoes
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VOLCANISM: Its Features
Editor's Notes
Why do volcanoes erupt?
The heat from the inside of the earth creates pressure and pushes up through weak spots in the crust like at the edge of plates or in hot spots and causes volcanoes to erupt.
The tectonic plates are in constant motion, albeit very slow motion. They sometimes move toward each other, other times they’ll move apart, and still other times one will sink while the other rises above it. When a tectonic plate sinks, it sinks down into the mantle and becomes very hot. So hot, in fact, that the rock melts. This molten rock will gradually make its way up to the surface of the earth through a series of cracks. When it reaches the surface of the earth, we refer to it as lava. As layer upon layer of lava builds up, a volcano is formed.
1.- Magma 50-100 miles below the earth’s surface slowly begins to rise to the surface.
2.- As the magma rises it melts gaps in the surrounding rock.
3.- As more magma rises a large reservoir forms as close as 2 miles below the surface (magma chamber)
4.- Pressure from the surrounding rock causes the magma to blast or melt a conduit (channel) to the surface where magma erupts onto the surface through a vent (opening).
5.- The magma, now called lava, builds up at the vent forming a volcano.
6.- Often the volcano sides will be higher than the vent forming a depression called a crater
A few volcanoes are formed by hot spots. Hot spots are incredibly hot places in the mantle where it has melted a hole through the crust.
•When the plates move over the hot spot it can form new volcanoes like the Hawaiian Islands.
Roughly 90% of all earthquakes occur along the Ring of Fire, and the ring is dotted with 75% of all active volcanoes on Earth.
A string of 452 volstretches from the southern tip of South America, up along the coast of North America, across the Bering Strait, down through Japan, and into New Zealand
At least some of
the magma (molten rock or liquid that is mostly silica) works
its way upward to the earth's surface to erupt. Magma does not
always reach the earth's surface before solidifying, but when it
does it is called lava.
At Mount St. Helens the lava solidified quickly as it was
blasted explosively by gases into the air, producing rock fragments
known as pyroclasts (from the Greekpyro, "fire," and
clart, "broken"). Pyroclastic debris is also known as tcphra.
Elsewhere in the world (notably Hawaii) lava extrudes out of
fissures in the ground as lava flows. Pyrodastic debris and
rock formed by solidification of lava are collectively regarded
as extrusive rock, surface rock resulting from volcanic
acrivity.
At least some of
the magma (molten rock or liquid that is mostly silica) works
its way upward to the earth's surface to erupt. Magma does not
always reach the earth's surface before solidifying, but when it
does it is called lava.
At Mount St. Helens the lava solidified quickly as it was
blasted explosively by gases into the air, producing rock fragments
known as pyroclasts (from the Greekpyro, "fire," and
clart, "broken"). Pyroclastic debris is also known as tcphra.
Elsewhere in the world (notably Hawaii) lava extrudes out of
fissures in the ground as lava flows. Pyrodastic debris and
rock formed by solidification of lava are collectively regarded
as extrusive rock, surface rock resulting from volcanic
acrivity.
At least some of
the magma (molten rock or liquid that is mostly silica) works
its way upward to the earth's surface to erupt. Magma does not
always reach the earth's surface before solidifying, but when it
does it is called lava.
At Mount St. Helens the lava solidified quickly as it was
blasted explosively by gases into the air, producing rock fragments
known as pyroclasts (from the Greekpyro, "fire," and
clart, "broken"). Pyroclastic debris is also known as tcphra.
Elsewhere in the world (notably Hawaii) lava extrudes out of
fissures in the ground as lava flows. Pyrodastic debris and
rock formed by solidification of lava are collectively regarded
as extrusive rock, surface rock resulting from volcanic
acrivity.
Volcanic rocks, and the magma from which they formed, have a silica content that ranges from 45% to 75% by weight. Felsic rocks are silica-rich (65% or more SiO2) rocks. Rhyolite is the most abundant silica volcanic rock. Mafic rocks are silica-diffecient rocks. Their silica content is close to 50%. Basalt is the most common mafic rock. Intermediate rocks have a chemical content between that of felsic and mafic rocks. The most common intermediate rock is andesite.
Mafic, intermediate, felic
A famous composite volcano is Mt. Saint Helens in Washington state. In 1980, it erupted destroying most of the life around it and sending ash across much of the western United States.
A famous cinder cone volcano is Paricutin in Mexico.
However they pour out a lot more lava over a long period of time. One of the most famous shield volcanoes is MuanaLoa in Hawaii.
During an eruption, expanding, hot gases may propel pyroclastics high into the atmosphere as a column rising from a volcano.
Scoria - cindery, vesicular basaltic lava, typically having a frothy texture.
Fume- gas, smoke, or vapor that smells strongly or is dangerous to inhale.
Plume-a long, soft feather or arrangement of feathers used by a bird for display or worn by a person for ornament.
NOAA-National Oceanic and Atmospheric Administration
Pahoehoe and aa lava are strikingly different in appearance but their composition may be identical or very similar. Lava flow that was originally pahoehoe may transform into aa lava but the reverse is impossible — once lava crust is broken it can not return back to smooth and continuous form3.
Aa and pahoehoe are terms that were brought to geological terminology from the Hawaiian language. Aa is according to native Hawaiians a sound one makes if he or she tries to walk barefoot on such a lava flow. There are different spelling versions, ‘a’a, a’a, a-aa are used as well as simple aa. Pahoehoe means in Hawaiian “on which one can walk”6.
Walking on it is very slow and potentially dangerous even if one has good hiking boots. It is such a miserable experience because the uppermost part of aa lava is composed of loose clinkery unstable blocks. You can never be sure that the rocks you are stepping on do not move. They often do. This means that ground beneath your feet is unstable and you may easily lose balance.
They are a classic geological indicator that the area you are standing in was once under water. Pillow lavas are a very common eruption product, especially on seamounts, so understanding something about the conditions under which they form can help us understand how seamounts form.
Blocky lava flows resemble aa lavas. They also have highly irregular surfaces covered with debris but they contain larger lava blocks with smoother sides and angular edges with common dimensions from few decimeters to several meters. Blocky flows grow higher as they advance and may reach more than 100 meters in height3.
An active volcano is a volcano that has had at least one eruption during the past 10,000 years. An active volcano might be erupting or dormant.
An erupting volcano is an active volcano that is having an eruption...
A dormant volcano is an active volcano that is not erupting, but supposed to erupt again.
An extinct volcano has not had an eruption for at least 10,000 years and is not expected to erupt again in a comparable time scale of the future.