3.3Plates Move Apart
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Divergent boundaries occur where tectonic plates move apart from each other, forming mid-ocean ridges under the ocean and rift valleys on land. The ocean floor spreads from the mid-ocean ridges, with the newest rock closest to the ridges and oldest farthest away in a process called sea-floor spreading. Hot spots deep within the Earth's mantle can cause volcanic activity and are used to measure plate movement over time.
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Plate Tectonics Review Answers
1. Plate tectonics describes how the Earth's crust is broken into plates that move relative to each other as magma circulates underneath. Plates can divide, collide, or slide past one another at their boundaries.
2. There are three types of plate boundaries: divergent where plates move apart, convergent where they move together, and transform where they slide past each other horizontally.
3. At convergent boundaries, the plates squeeze rock as they move together or subduct one beneath the other.
Review: Continental Drift - Convection - SFS (NB p.70)
The document discusses evidence that supports the theory of continental drift, including the matching shapes of continents, matching fossil records, evidence of past climate changes, and matching rock formations found on separate continents. It also describes how convection currents in the mantle transfer heat from the core to the crust, causing the movement of tectonic plates at mid-ocean ridges where new ocean crust is formed through sea-floor spreading.
Split and separate!
The document contains answers to questions about plate tectonics and the movement of lithospheric plates. It explains that the stripes on the diagram represent rocks with normal and reverse magnetic polarities. The middle split represents the mid-ocean ridge, where seafloor spreading occurs and new crust is formed. The mid-ocean ridge is where the forces that push the lithospheric plates originate from. Magma rises from below the crust at the ridge and hardens to form new seafloor that moves away from the ridge. Subduction occurs at the side slits. The Earth does not get larger as plates move apart because as new crust is created at ridges, old crust is destroyed elsewhere.
Continental drift &and sea floor spreading
The document discusses the theories of continental drift, seafloor spreading, and plate tectonics. It provides details on the original proponent of continental drift theory, Alfred Wegener, in 1915. It also outlines various geological, climatic, and biological evidence that supports continental drift. The document then discusses the sea floor spreading theory proposed by Harry Hess in the 1960s, which helped explain continental drift. It notes evidence that the ocean floor becomes progressively younger near mid-ocean ridges. Finally, it describes how the theories of continental drift and sea floor spreading were combined into the comprehensive theory of plate tectonics.
Plate Tectonics
This ppt is about 3 theories of plate tectonics: Continental drift, seafloor spreading and theory of plate tectonics
Evidence of Sea-Floor Spreading
Rock samples near mid-ocean ridges provided evidence for sea floor spreading. The youngest rocks were found near the ridges, with older rocks located farther away, showing that new crust was being created at the ridges over time. Additional evidence came from magnetic striping patterns in the rocks, which recorded changes in Earth's magnetic field during the formation of new ocean crust along the ridges. Hydrothermal vents at the ridges also indicated that magma chambers must be close to the surface in order to heat the water emerging from the vents.
Plate Boundaries
The document discusses the structure and composition of the Earth, including the crust, mantle, outer core, and inner core. It also discusses plate tectonics and the different types of plate boundaries: constructive, destructive, conservative, and collision. At destructive boundaries, oceanic plates are subducted under continental plates, forming volcanoes. At collision boundaries, continental plates push together to form mountain ranges. At constructive boundaries, plates move apart and new crust is formed.
Transform Plate Boundaries
This document discusses tectonic plates and transform plate boundaries. It notes that tectonic plates are large pieces of rock that make up Earth's crust, and there are two main types - oceanic and continental plates. At transform boundaries, the plates move horizontally past one another, driven by convection currents in the underlying mantle. When the plates rub together at these boundaries, it causes huge stress that results in earthquakes, faults, and tsunamis.
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Plate Tectonics Review Answers
1. Plate tectonics describes how the Earth's crust is broken into plates that move relative to each other as magma circulates underneath. Plates can divide, collide, or slide past one another at their boundaries.
2. There are three types of plate boundaries: divergent where plates move apart, convergent where they move together, and transform where they slide past each other horizontally.
3. At convergent boundaries, the plates squeeze rock as they move together or subduct one beneath the other.
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The document discusses evidence that supports the theory of continental drift, including the matching shapes of continents, matching fossil records, evidence of past climate changes, and matching rock formations found on separate continents. It also describes how convection currents in the mantle transfer heat from the core to the crust, causing the movement of tectonic plates at mid-ocean ridges where new ocean crust is formed through sea-floor spreading.
Split and separate!
The document contains answers to questions about plate tectonics and the movement of lithospheric plates. It explains that the stripes on the diagram represent rocks with normal and reverse magnetic polarities. The middle split represents the mid-ocean ridge, where seafloor spreading occurs and new crust is formed. The mid-ocean ridge is where the forces that push the lithospheric plates originate from. Magma rises from below the crust at the ridge and hardens to form new seafloor that moves away from the ridge. Subduction occurs at the side slits. The Earth does not get larger as plates move apart because as new crust is created at ridges, old crust is destroyed elsewhere.
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The document discusses the theories of continental drift, seafloor spreading, and plate tectonics. It provides details on the original proponent of continental drift theory, Alfred Wegener, in 1915. It also outlines various geological, climatic, and biological evidence that supports continental drift. The document then discusses the sea floor spreading theory proposed by Harry Hess in the 1960s, which helped explain continental drift. It notes evidence that the ocean floor becomes progressively younger near mid-ocean ridges. Finally, it describes how the theories of continental drift and sea floor spreading were combined into the comprehensive theory of plate tectonics.
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Evidence of Sea-Floor Spreading
Rock samples near mid-ocean ridges provided evidence for sea floor spreading. The youngest rocks were found near the ridges, with older rocks located farther away, showing that new crust was being created at the ridges over time. Additional evidence came from magnetic striping patterns in the rocks, which recorded changes in Earth's magnetic field during the formation of new ocean crust along the ridges. Hydrothermal vents at the ridges also indicated that magma chambers must be close to the surface in order to heat the water emerging from the vents.
Plate Boundaries
The document discusses the structure and composition of the Earth, including the crust, mantle, outer core, and inner core. It also discusses plate tectonics and the different types of plate boundaries: constructive, destructive, conservative, and collision. At destructive boundaries, oceanic plates are subducted under continental plates, forming volcanoes. At collision boundaries, continental plates push together to form mountain ranges. At constructive boundaries, plates move apart and new crust is formed.
Transform Plate Boundaries
This document discusses tectonic plates and transform plate boundaries. It notes that tectonic plates are large pieces of rock that make up Earth's crust, and there are two main types - oceanic and continental plates. At transform boundaries, the plates move horizontally past one another, driven by convection currents in the underlying mantle. When the plates rub together at these boundaries, it causes huge stress that results in earthquakes, faults, and tsunamis.
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New evidence supported the theory of sea floor spreading and plate tectonics. Mapping of the seafloor using sonar revealed a mid-ocean ridge running through the Atlantic Ocean. Rocks near the ridge are younger, becoming progressively older further from the ridge, showing new crust is generated at the ridge through sea floor spreading. While new crust is created at ridges, older oceanic crust is recycled back into the Earth through subduction at plate boundaries, keeping the size of the Earth stable over time. This evidence of sea floor spreading supported Wegener's theory of continental drift.
Study of plate tectonics of the earth, or plate movement,
a) Wegener’s Evidence (Continental Drift)
b) History of Plate Tectonics
c) Breakup and Appearence of Pangea
WHAT IS A PLATE?
Major continental and oceanic plates include:
Types of Earth’s Crust:
Plate tectonics (from the Late Latin tectonicus) is a scientific theory which describes the large scale motions of Earth's lithosphere.
THE DYNAMIC EARTH:
The earth is a dynamic planet, continuously changing both externally and internally. The earth’s surface is constantly being changed by endo-genetic processes resulting in volcanism and tectonism, and exogenetic processes such as erosion and deposition. These processes have been active throughout geological history. The processes that change the surface feature are normally very slow (erosion and deposition) except some catastrophic changes that occur instantaneously as in the case of volcanism or earthquakes. The interior of the earth is also in motion. Deeper inside the earth, the liquid core probably flows at a geologically rapid rate of a few tenths of mm/s. Several hypotheses attempted to explain the dynamism of the earth.
+ Horizontal movement hypothesis
+ Continental drift, displacement hypothesis
Development of the plate tectonic theory.
Plate tectonic theory arose out of the hypothesis of continental drift proposed by Alfred Wegener in 1912. He suggested that the present continents once formed a single land mass that drifted apart, thus releasing the continents from the Earth's core and likening them to "icebergs" of low density granite floating on a sea of denser basalt.
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The first evidence that the lithospheric plates did move came with the discovery of variable magnetic field direction in rocks of differing ages.
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The document summarizes plate tectonics and the structure and dynamics of the Earth. It describes the four main layers of the Earth and explains that plate tectonics involves the constant motion of tectonic plates due to convection currents in the mantle. It provides evidence that supported the theory of continental drift and discusses how sea floor spreading and subduction at trenches cause the plates to move over time.
Plate tectonics
1. Plate tectonics refers to the theory that the Earth's crust is divided into tectonic plates that slowly move and interact with one another.
2. The main types of plate boundaries are divergent boundaries where plates move apart, convergent boundaries where plates collide, and transform boundaries where plates slide past one another.
3. Key features associated with these boundaries include mountain building at convergent zones, volcanism and rifting at divergent zones, and strike-slip faulting along transform boundaries.
Sea floor spreading
The document summarizes evidence that supports the theory of seafloor spreading and plate tectonics. It describes how Harry Hess first proposed in 1962 that new ocean crust is formed at mid-ocean ridges through volcanic activity and magma cooling. As more magma is added, it pushes older ocean crust further from the ridges, providing evidence that the plates are moving. Studies of magnetic reversals in ocean floor basalts also indicate the age of the crust increases further from ridges, confirming seafloor is continually being created and destroyed over time.
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1) The document discusses plate tectonics, describing the different types of plates (oceanic and continental), how there are 6 major and 20 minor tectonic plates, and the three types of plate boundaries - divergent, convergent, and transform.
2) It provides details on sea floor spreading and paleomagnetism as evidence for plate tectonics, describing how sea floor spreading occurs at mid-ocean ridges and how paleomagnetism records the magnetic properties in older rocks.
3) Plate tectonics theory postulates that the lithosphere is made up of these rigid tectonic plates that move over Earth's surface, and that geological activities occur at plate boundaries.
Plate Tectonics
The document discusses plate tectonics and the structure and dynamics of the Earth's interior. It describes how the crust is broken into plates that move atop the mantle due to convection currents, and the three types of plate boundaries: divergent where plates move apart, convergent where they move together, and transform where they slide past each other. It provides examples of associated geological features like mid-ocean ridges, subduction zones, volcanoes, and earthquakes.
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This document describes the four main types of plate tectonic boundaries: divergent, convergent, transform, and subduction. At divergent boundaries, plates move apart from each other, creating mid-ocean ridges and rift valleys on land. At convergent boundaries, plates move toward each other, resulting in mountain building or one plate subducting under the other. Transform boundaries involve plates sliding horizontally past one another, forming strike-slip faults. Subduction occurs when one oceanic plate sinks beneath another plate into the mantle.
Divergent boundary
Divergent plate boundaries occur when tectonic plates pull apart from each other. Rising convection currents in the mantle push up on lithospheric plates, stretching and thinning the crust until it breaks along parallel faults tilted outward. This forms mid-ocean ridges or rift valleys on land. As the plates continue diverging, new crust is formed by magma rising through the cracks from the asthenosphere. Examples of divergent boundaries include the East Africa rift and Rio Grande rift.
Sea-Floor Spreading Notes - Jenny
Scientists in the 1950s used sonar to map the mid-ocean ridge and discovered it was not flat but made of underwater mountains. This discovery led them to research what the ridge was and how it formed. Evidence from molten rock formations, magnetic patterns in the ocean crust, and sediment core samples supported Harry Hess's theory from 1960 that the ocean floors spread from the mid-ocean ridge in a conveyor belt-like motion, pushing the continents. This process of sea-floor spreading continually recycles the ocean crust through subduction at deep ocean trenches.
Plate boundaries
This document discusses the different types of plate boundaries including convergent, divergent, and transform boundaries. At convergent boundaries, plates move toward each other forming trenches and volcanic arcs at oceanic-continental boundaries and trenches and island arcs at oceanic-oceanic boundaries. Continental-continental convergent boundaries form mountains. Transform boundaries occur when plates slide past each other, forming tsunamis at oceanic-oceanic boundaries and earthquakes at continental-continental boundaries. Divergent boundaries form when plates move apart, creating mid-ocean ridges at oceanic-oceanic boundaries and rift valleys at continental-continental boundaries.
Sea floor spreading
1) The Mid-Ocean Ridge system circles the Earth along the ocean floor and is over 56,000 km long. It forms at divergent plate boundaries where new oceanic crust is continually being formed.
2) Scientists use sonar to map the ocean floor and study its features like the Mid-Ocean Ridge. Sonar bounces sound waves off underwater objects to image the seafloor.
3) Evidence like magnetic stripes in ocean crust and samples dug from the seafloor support the theory of sea floor spreading, where new crust forms at ridges and spreads out over time.
Chapter 10 ii
1) Scientists discovered underwater mountain ranges called mid-ocean ridges using sound waves, and Harry Hess proposed the theory of seafloor spreading to explain them.
2) Seafloor spreading involves hot material rising at ridges and flowing sideways, carrying the seafloor away as new material cools and forms at the cracks.
3) Evidence for seafloor spreading includes younger rocks at ridges and magnetic reversals recorded in strips of rock parallel to ridges.
Subduction zones Convection currents and continental drift
Subduction zones occur where one tectonic plate slides under another, usually around the Ring of Fire. Convection currents in the mantle cause rocks to rise and fall, powering plate tectonics at the Asthenosphere. Continental drift is when tectonic plate movements cause continents to shift positions over time, an idea first proposed by Alfred Wegener based on matching coastlines, shared rock types, and fossil evidence between continents that were once joined together in the supercontinent Pangaea.
Sea floor spreading
Seafloor spreading is the process by which new oceanic crust is formed through volcanic activity at mid-ocean ridges, pushing the tectonic plates apart. Magma rises through cracks between the plates and hardens into new crust, causing the plates to spread further. This spreading helps explain continental drift and the theory of plate tectonics.
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The document describes the four main types of plate boundaries:
1) Divergent boundaries occur at spreading centers where new crust is created and plates move apart, such as at the Mid-Atlantic Ridge.
2) Convergent boundaries exist where plates collide and one is subducted under the other, forming deep ocean trenches.
3) Transform boundaries result from two plates sliding past each other horizontally, such as along the San Andreas Fault.
4) Continent-continent collisions buckle and uplift massive mountain ranges, as when India collided with Asia to form the Himalayas.
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The document discusses plate tectonics and the different types of plate boundaries. It explains that tectonic plates are giant pieces of the Earth's crust that are constantly moving. There are three main types of plate boundaries: constructive boundaries where plates move apart and new crust is formed, destructive boundaries where one plate moves under another, and conservative boundaries such as transform faults that offset movement at plate margins. The document also includes quiz questions to test understanding of these concepts.
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The document discusses Earth's structure and plate tectonics. It describes how Earth formed layers with different densities, including the inner and outer core, mantle, crust, and lithosphere. The lithosphere is made up of tectonic plates that move over time. There are three types of plate boundaries - divergent where plates move apart, convergent where they push together, and transform where they scrape past each other. Plate tectonics explains how continents have changed positions over billions of years and continue to move today.
Chapter 1 plate tectonics power point
The document summarizes key aspects of plate tectonics theory, including:
1) Earth is made up of layers with different densities and properties, including the crust, mantle, outer core, and inner core.
2) The lithosphere is made of tectonic plates that move over time, splitting and colliding in various ways. This explains continental drift and the movement of continents.
3) Tectonic plates interact at three main types of boundaries - divergent where plates move apart, convergent where they push together, and transform where they slide past each other. These boundary interactions shape Earth's surface over geological time.
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The movement of earth's plate is responsible for the formation of continents.How it works ? what are the principle's?
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Sea Floor Spreading
New evidence supported the theory of sea floor spreading and plate tectonics. Mapping of the seafloor using sonar revealed a mid-ocean ridge running through the Atlantic Ocean. Rocks near the ridge are younger, becoming progressively older further from the ridge, showing new crust is generated at the ridge through sea floor spreading. While new crust is created at ridges, older oceanic crust is recycled back into the Earth through subduction at plate boundaries, keeping the size of the Earth stable over time. This evidence of sea floor spreading supported Wegener's theory of continental drift.
Study of plate tectonics of the earth, or plate movement,
a) Wegener’s Evidence (Continental Drift)
b) History of Plate Tectonics
c) Breakup and Appearence of Pangea
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Major continental and oceanic plates include:
Types of Earth’s Crust:
Plate tectonics (from the Late Latin tectonicus) is a scientific theory which describes the large scale motions of Earth's lithosphere.
THE DYNAMIC EARTH:
The earth is a dynamic planet, continuously changing both externally and internally. The earth’s surface is constantly being changed by endo-genetic processes resulting in volcanism and tectonism, and exogenetic processes such as erosion and deposition. These processes have been active throughout geological history. The processes that change the surface feature are normally very slow (erosion and deposition) except some catastrophic changes that occur instantaneously as in the case of volcanism or earthquakes. The interior of the earth is also in motion. Deeper inside the earth, the liquid core probably flows at a geologically rapid rate of a few tenths of mm/s. Several hypotheses attempted to explain the dynamism of the earth.
+ Horizontal movement hypothesis
+ Continental drift, displacement hypothesis
Development of the plate tectonic theory.
Plate tectonic theory arose out of the hypothesis of continental drift proposed by Alfred Wegener in 1912. He suggested that the present continents once formed a single land mass that drifted apart, thus releasing the continents from the Earth's core and likening them to "icebergs" of low density granite floating on a sea of denser basalt.
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The document summarizes plate tectonics and the structure and dynamics of the Earth. It describes the four main layers of the Earth and explains that plate tectonics involves the constant motion of tectonic plates due to convection currents in the mantle. It provides evidence that supported the theory of continental drift and discusses how sea floor spreading and subduction at trenches cause the plates to move over time.
Plate tectonics
1. Plate tectonics refers to the theory that the Earth's crust is divided into tectonic plates that slowly move and interact with one another.
2. The main types of plate boundaries are divergent boundaries where plates move apart, convergent boundaries where plates collide, and transform boundaries where plates slide past one another.
3. Key features associated with these boundaries include mountain building at convergent zones, volcanism and rifting at divergent zones, and strike-slip faulting along transform boundaries.
Sea floor spreading
The document summarizes evidence that supports the theory of seafloor spreading and plate tectonics. It describes how Harry Hess first proposed in 1962 that new ocean crust is formed at mid-ocean ridges through volcanic activity and magma cooling. As more magma is added, it pushes older ocean crust further from the ridges, providing evidence that the plates are moving. Studies of magnetic reversals in ocean floor basalts also indicate the age of the crust increases further from ridges, confirming seafloor is continually being created and destroyed over time.
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1) The document discusses plate tectonics, describing the different types of plates (oceanic and continental), how there are 6 major and 20 minor tectonic plates, and the three types of plate boundaries - divergent, convergent, and transform.
2) It provides details on sea floor spreading and paleomagnetism as evidence for plate tectonics, describing how sea floor spreading occurs at mid-ocean ridges and how paleomagnetism records the magnetic properties in older rocks.
3) Plate tectonics theory postulates that the lithosphere is made up of these rigid tectonic plates that move over Earth's surface, and that geological activities occur at plate boundaries.
Plate Tectonics
The document discusses plate tectonics and the structure and dynamics of the Earth's interior. It describes how the crust is broken into plates that move atop the mantle due to convection currents, and the three types of plate boundaries: divergent where plates move apart, convergent where they move together, and transform where they slide past each other. It provides examples of associated geological features like mid-ocean ridges, subduction zones, volcanoes, and earthquakes.
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This document describes the four main types of plate tectonic boundaries: divergent, convergent, transform, and subduction. At divergent boundaries, plates move apart from each other, creating mid-ocean ridges and rift valleys on land. At convergent boundaries, plates move toward each other, resulting in mountain building or one plate subducting under the other. Transform boundaries involve plates sliding horizontally past one another, forming strike-slip faults. Subduction occurs when one oceanic plate sinks beneath another plate into the mantle.
Divergent boundary
Divergent plate boundaries occur when tectonic plates pull apart from each other. Rising convection currents in the mantle push up on lithospheric plates, stretching and thinning the crust until it breaks along parallel faults tilted outward. This forms mid-ocean ridges or rift valleys on land. As the plates continue diverging, new crust is formed by magma rising through the cracks from the asthenosphere. Examples of divergent boundaries include the East Africa rift and Rio Grande rift.
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Scientists in the 1950s used sonar to map the mid-ocean ridge and discovered it was not flat but made of underwater mountains. This discovery led them to research what the ridge was and how it formed. Evidence from molten rock formations, magnetic patterns in the ocean crust, and sediment core samples supported Harry Hess's theory from 1960 that the ocean floors spread from the mid-ocean ridge in a conveyor belt-like motion, pushing the continents. This process of sea-floor spreading continually recycles the ocean crust through subduction at deep ocean trenches.
Plate boundaries
This document discusses the different types of plate boundaries including convergent, divergent, and transform boundaries. At convergent boundaries, plates move toward each other forming trenches and volcanic arcs at oceanic-continental boundaries and trenches and island arcs at oceanic-oceanic boundaries. Continental-continental convergent boundaries form mountains. Transform boundaries occur when plates slide past each other, forming tsunamis at oceanic-oceanic boundaries and earthquakes at continental-continental boundaries. Divergent boundaries form when plates move apart, creating mid-ocean ridges at oceanic-oceanic boundaries and rift valleys at continental-continental boundaries.
Sea floor spreading
1) The Mid-Ocean Ridge system circles the Earth along the ocean floor and is over 56,000 km long. It forms at divergent plate boundaries where new oceanic crust is continually being formed.
2) Scientists use sonar to map the ocean floor and study its features like the Mid-Ocean Ridge. Sonar bounces sound waves off underwater objects to image the seafloor.
3) Evidence like magnetic stripes in ocean crust and samples dug from the seafloor support the theory of sea floor spreading, where new crust forms at ridges and spreads out over time.
Chapter 10 ii
1) Scientists discovered underwater mountain ranges called mid-ocean ridges using sound waves, and Harry Hess proposed the theory of seafloor spreading to explain them.
2) Seafloor spreading involves hot material rising at ridges and flowing sideways, carrying the seafloor away as new material cools and forms at the cracks.
3) Evidence for seafloor spreading includes younger rocks at ridges and magnetic reversals recorded in strips of rock parallel to ridges.
Subduction zones Convection currents and continental drift
Subduction zones occur where one tectonic plate slides under another, usually around the Ring of Fire. Convection currents in the mantle cause rocks to rise and fall, powering plate tectonics at the Asthenosphere. Continental drift is when tectonic plate movements cause continents to shift positions over time, an idea first proposed by Alfred Wegener based on matching coastlines, shared rock types, and fossil evidence between continents that were once joined together in the supercontinent Pangaea.
Sea floor spreading
Seafloor spreading is the process by which new oceanic crust is formed through volcanic activity at mid-ocean ridges, pushing the tectonic plates apart. Magma rises through cracks between the plates and hardens into new crust, causing the plates to spread further. This spreading helps explain continental drift and the theory of plate tectonics.
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The document describes the four main types of plate boundaries:
1) Divergent boundaries occur at spreading centers where new crust is created and plates move apart, such as at the Mid-Atlantic Ridge.
2) Convergent boundaries exist where plates collide and one is subducted under the other, forming deep ocean trenches.
3) Transform boundaries result from two plates sliding past each other horizontally, such as along the San Andreas Fault.
4) Continent-continent collisions buckle and uplift massive mountain ranges, as when India collided with Asia to form the Himalayas.
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The document discusses plate tectonics and the different types of plate boundaries. It explains that tectonic plates are giant pieces of the Earth's crust that are constantly moving. There are three main types of plate boundaries: constructive boundaries where plates move apart and new crust is formed, destructive boundaries where one plate moves under another, and conservative boundaries such as transform faults that offset movement at plate margins. The document also includes quiz questions to test understanding of these concepts.
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The document discusses Earth's structure and plate tectonics. It describes how Earth formed layers with different densities, including the inner and outer core, mantle, crust, and lithosphere. The lithosphere is made up of tectonic plates that move over time. There are three types of plate boundaries - divergent where plates move apart, convergent where they push together, and transform where they scrape past each other. Plate tectonics explains how continents have changed positions over billions of years and continue to move today.
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The document summarizes key aspects of plate tectonics theory, including:
1) Earth is made up of layers with different densities and properties, including the crust, mantle, outer core, and inner core.
2) The lithosphere is made of tectonic plates that move over time, splitting and colliding in various ways. This explains continental drift and the movement of continents.
3) Tectonic plates interact at three main types of boundaries - divergent where plates move apart, convergent where they push together, and transform where they slide past each other. These boundary interactions shape Earth's surface over geological time.
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Wegener's continental drift hypothesis proposed that the continents were once joined together in a supercontinent called Pangaea before breaking apart around 200 million years ago. Evidence for continental drift includes matching fossils found on separate continents, matching rock types and mountain structures that end at one coastline and reappear across an ocean, and indications of ancient shared climates. Plate tectonics theory holds that the lithosphere, the rigid outer layer of Earth, is broken into plates that move over the asthenosphere in the upper mantle. There are three types of plate boundaries: divergent where plates move apart, convergent where they move together, and transform where they grind past each other.
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GOAL: To create a poster that explains the phenomena of blue sky using the concept of wavelength and frequency of visible light.
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Article Reading
Earthquake wreaks havoc in the Philippines more than 1,000 people are killed when a 7.7-magnitude earthquake strikes Luzon Island in the Philippines on this day in 1990. The massive tremor wreaked havoc across a sizeable portion of Luzon, the country’s largest island, with Baguio City suffering the most devastating effects.
The epicenter of the quake, which struck at 4:26 p.m., was north of Manila in the Nueva Ecija province. Reports indicate that the shaking went on for nearly a full minute. Collapsing buildings were the main cause of damage and death. Getting out of a multi-story building was a good safety precaution that afternoon, although many people were injured and a few even died in stampedes of others doing the same thing.
At Christian College, a six-story building completely collapsed, trapping approximately 250 students and teachers inside. Heroic rescue efforts saved many, but some victims who did not die in the collapse were found dead later from dehydration because they were not pulled out in time.
All types of buildings, including several resort hotels in Baguio, known as the
Philippines’ Summer Capital, suffered tremendous damage. Most of the city’s 100,000
residents slept outdoors that evening and during the following week, afraid to return to
their homes amid the frequent aftershocks. For days, workers pulled bodies from the
demolished buildings in Baguio. The best estimate is that 1,000 bodies were eventually
recovered. At least another 1,000 people suffered serious injuries. Rescue efforts were
hampered severely because the three main roads into the city were blocked by landslides. Hundreds of motorists were stranded on the roads as well.
A fault is a fracture or zone of fractures between two blocks of
rock. Faults allow the blocks to move relative to each other.
This movement may occur rapidly, in the form of an earthquake - or may occur slowly, in the form of creep. Faults may range in length from a few millimeters to thousands of kilometers. Most faults produce repeated displacements over geologic time.
The ground in the area of fault tends to remain not moving
because of frictional force between the two opposing plates (boxes). As stronger forces (rubber band) shakes up the fault, the friction (tape) can no longer hold up the plates (box) thus resulting to a slip in the plates t
The Theory of Tectonic Plates 7.3.ppt
The document summarizes plate tectonics and tectonic plate boundaries. There are three main types of plate boundaries - convergent where plates move towards each other, divergent where they move apart, and transform where they slide past each other. At convergent boundaries, mountain ranges form at continental-continental collisions while subduction zones and volcanoes form at oceanic-continental and oceanic-oceanic collisions. New seafloor is created at divergent boundaries through sea floor spreading as magma rises between separating plates. Transform boundaries create earthquakes as plates grind past each other.
The Theory of Tectonic Plates 7.3.ppt
The document summarizes plate tectonics and tectonic plate boundaries. There are three main types of plate boundaries - convergent where plates move towards each other, divergent where they move apart, and transform where they slide past each other. At convergent boundaries, mountain ranges form at continental-continental collisions while subduction zones and volcanoes form at oceanic-continental and oceanic-oceanic collisions. New seafloor is created at divergent boundaries through sea floor spreading as magma rises between separating plates. Transform boundaries create earthquakes as plates grind past each other.
PLATE TECTONICS.ppt.....................
The document summarizes plate tectonic theory, which describes how Earth's lithospheric plates move and interact at boundaries. There are three main types of plate boundaries - divergent boundaries where plates move apart, convergent boundaries where they move together, and transform boundaries where they slide past each other. Earthquakes and volcanic activity occur primarily at these boundaries. Evidence for plate tectonics includes magnetic patterns in oceanic rocks and the matching shapes of separated continents.
Fault, Stress and Plate-Boundaries in Earth Science
The landform associated with oceanic crust subducting under continental crust is a volcanic arc.
Plate Tectonics - Chapter 5
Geologists have learned about Earth's interior through examining rock samples and studying seismic waves. Temperature and pressure both increase with depth inside Earth. The crust and mantle are divided into layers with different physical properties. Convection currents in the mantle are driven by heat from the core and cause the tectonic plates to slowly move over time. The theory of plate tectonics explains how new crust forms at mid-ocean ridges and old crust is recycled into the mantle at subduction zones, causing the plates to drift apart or collide together over hundreds of millions of years.
Continental-Drift_Seafloor-spreading.pptx
Alfred Wegener first proposed the continental drift hypothesis in the early 1900s, which theorized that the continents were once joined together in a supercontinent called Pangaea before drifting apart to their current locations. We now know from the theory of plate tectonics that Pangaea existed around 245 million years ago and later split into the continents of Laurasia and Gondwana. Sea-floor spreading at mid-ocean ridges drives the movement of tectonic plates and the formation of new oceanic crust, which is evidenced by magnetic reversals recorded in oceanic rocks over time.
WHAT IS A PLATE? MAJOR PLATES. Types of Earth’s Crust. Plate Boundary
The document discusses plate tectonics and the key concepts of plate tectonic theory. It describes how the lithosphere is broken into large plates that move over Earth's surface, driven by convection currents in the underlying mantle. It outlines the three main types of plate boundaries - divergent boundaries where new crust forms, transform boundaries where plates slide past each other, and convergent boundaries where plates collide and one slides under the other. It also discusses the evidence that supported the development of plate tectonic theory, such as seafloor spreading and magnetic reversals recorded in oceanic crust.
Plate Tectonics Theory.pdf
1) Alfred Wegener first proposed the continental drift theory in 1912, hypothesizing that continents move and were once joined in a supercontinent.
2) The plate tectonics theory explains that the outer part of the Earth is made up of plates that move over time, interacting at boundaries.
3) There are three main types of plate boundaries - divergent where plates move apart, convergent where they collide, and transform where they slide past each other. These boundaries give rise to geologic features through processes like seafloor spreading and subduction.
Lecture 2-The Dynamic Earth.pdf
This document provides information about plate tectonics and the dynamics of the Earth. It discusses key topics such as continental drift, Earth's layered structure, types of plate boundaries including convergent, divergent and transform boundaries, seafloor spreading, plate motions, and forces driving plate tectonics. The objectives are to understand concepts like continental drift, Earth's structure, plate margins, seafloor spreading, how plates move on the surface of the sphere, and driving forces. Diagrams and figures are included to illustrate these topics.
2012 updated plate tectonics new one use this one backup
Plate tectonics theory proposes that Earth's outermost layer is broken into rigid tectonic plates that constantly move atop the asthenosphere in response to convection currents in the mantle, interacting along plate boundaries through divergent, convergent, and transform motion that creates geologic features like mid-ocean ridges, trenches, volcanoes, and earthquakes. Mapping of the seafloor revealed evidence like magnetic stripes and the ages of rocks that supported seafloor spreading and subduction, leading scientists in the 1960s to combine these ideas with continental drift into the unified theory of plate tectonics.
SGD-Escie.pdf
This document provides information about plate tectonics and volcanism in a question-answer format. It defines key terms like Pangaea, continental drift theory, plate tectonics theory, and the three types of plate boundaries. It describes evidence that supported continental drift and Wegener's hypothesis. It also explains concepts like slab pull, ridge push, and mantle convection that drive plate tectonics. Volcanism topics covered include the Ring of Fire, types of volcanoes like shield and composite, and volcanic features like calderas, cinder cones, and pyroclastic flows.
Plate Tectonics
The document summarizes key concepts about plate tectonics from a textbook chapter. It discusses:
1) Evidence that initially supported continental drift theory including matching continents, fossil matches, and rock structures.
2) The development of the plate tectonics theory to explain continental movement, with rigid plates that move over Earth's mantle.
3) The three main types of plate boundaries - divergent where plates move apart, convergent where they move together, and transform where they grind past each other.
Seafloor spreading theory discuss 3
1. Harry Hess proposed the theory of seafloor spreading in 1962, which provided evidence that Wegener's theory of continental drift was correct. Hess theorized that new ocean crust is formed at mid-ocean ridges through volcanic eruptions and then spreads outwards, pushing older crust farther away.
2. Evidence for seafloor spreading includes rock formations only possible from cooled lava, magnetic stripe patterns in ocean crust recording reversals of Earth's magnetic field, and drilling samples showing younger rock nearer to ridges.
3. Seafloor spreading is driven by convection currents in the Earth's mantle; subduction zones allow parts of ocean crust to sink back into the mantle and regulate ocean size.
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The Theory of Tectonic Plates - earth tectonic plates
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WHAT IS A PLATE? MAJOR PLATES. Types of Earth’s Crust. Plate Boundary
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2012 updated plate tectonics new one use this one backup
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This document discusses the different forms that energy can take, including mechanical, sound, chemical, thermal, electromagnetic, nuclear, kinetic, and potential energy. Mechanical energy moves objects, sound energy comes from particle vibrations, chemical energy is stored in matter, thermal energy comes from atomic movement, electromagnetic energy involves radiation, nuclear energy involves atomic reactions, kinetic energy depends on mass and speed, and potential energy depends on position or composition. The document provides examples and brief explanations of each type of energy.
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The document defines electromagnetic waves and asks a series of questions about them including: 1) What is the disappearance of an EM wave into a medium? 2) How are materials that transmit light classified? 3) What is a way to filter light so all waves vibrate in the same direction?
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An electromagnetic wave transfers energy through a field and forms when atomic particles become electrically charged. EM waves come in a spectrum and most that reach Earth come from the Sun. They travel at 186,000 miles per second in a vacuum, also known as the speed of light. Gamma rays are most harmful but can treat diseases while transparent materials allow light to pass through and opaque materials block it.
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Electromagnetic waves are waves that can travel through a vacuum and are created by the vibration of an electric charge. The electromagnetic spectrum consists of 7 components ranging from gamma rays to radio waves, with gamma rays having the highest frequency and shortest wavelength and radio waves having the lowest frequency and longest wavelength. Each type of electromagnetic wave has different uses such as using gamma rays to kill cancer cells, X-rays to take pictures of bones, ultraviolet light to detect counterfeit notes, and visible light to enable sight.
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2.2
Pitch is determined by frequency, with higher pitches corresponding to higher frequencies. Humans can hear sounds between 20-20,000 Hz. Natural frequency is the rate at which an object vibrates naturally, and resonance occurs when a sound wave matches this natural vibration. Timbre, or sound quality, is affected by the combination of frequencies present and how the sound begins and ends.
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1.3
Waves behave predictably and interact with materials in several ways. Waves reflect when hitting a barrier by bouncing back, refract by bending when entering a new medium at an angle, diffract by spreading out through openings or around obstacles, and interfere by either constructively adding to make larger waves or destructively canceling each other out. The document discusses key wave behaviors like reflection, refraction, diffraction, and interference and provides examples of each.
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3.3Plates Move Apart
- 1. Plates Move Apart Pages 82-88 (section B)