Lesson 3 Types Of Volcanoes
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The document describes different types of volcanoes including active, dormant, and extinct volcanoes. It explains the differences between shield volcanoes and composite volcanoes. Shield volcanoes occur at constructive plate boundaries and have runny lava that flows far from the vent, giving them gentle sides. Composite volcanoes occur at destructive plate boundaries and have viscous lava that cannot flow far, making them steep sided and prone to violent eruptions when pressure builds. The document asks questions about potential hazards from volcanic eruptions like pyroclastic flows, mudflows, and lava flows.
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Volcanoes form at constructive and destructive plate boundaries. At constructive boundaries, volcanoes form as magma rises through gaps created as plates move apart. These volcanoes are usually shield volcanoes. At destructive boundaries, one plate is subducted and melts, creating excess magma that erupts violently as composite volcanoes. Volcanoes can be active and currently erupting, dormant but capable of future eruptions, or extinct and not likely to erupt again. Hot spot volcanoes form from stationary plumes of magma rising through weak crust, creating island chains as plates move over hot spots.
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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
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This document discusses different types of volcanoes including composite volcanoes, shield volcanoes, cinder cones, and spatter cones. Composite volcanoes are formed from layers of lava and rock fragments, while shield volcanoes are formed from fluid basaltic lava flows. Cinder cones are steep, conical hills formed from ejected lava fragments, and spatter cones are accumulations of spatter clots that form around individual vents. The document also covers volcanic eruptions, impacts, and how volcanoes erupt by forcing magma through conduits and vents in various eruption styles.
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This document describes different types of volcanoes including composite volcanoes, shield volcanoes, cinder cones, and spatter cones. Composite volcanoes are tall and conical, built up from layers of lava and rock fragments. Shield volcanoes are wide and gently sloping due to fluid basaltic lava flows. Cinder cones form steep hills above vents and are built from ejected volcanic fragments. Spatter cones consist of welded together lava clots ejected from vents. The document also discusses volcanic eruptions and their varying impacts.
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Volcanoes erupt when magma finds an opening in the Earth's surface, shooting out lava, gas, and ash. This volcanic activity shapes the surface by forming mountains, islands, and other geological structures. Areas of tectonic plate movement experience more seismic activity and volcanoes, like the Pacific Ring of Fire. Common volcanic formations include cinder cones, which are small hills that typically erupt once, and stratovolcanoes, characterized by multiple eruptions and viscous lava forming tall mountains. Shield volcanoes have low viscosity lava that flows farther before hardening.
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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
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Volcanoes are formed when magma from the Earth's upper mantle works its way to the surface and erupts. There are over 1,500 active volcanoes on Earth. Volcanic eruptions occur when pressure builds up from magma and gases below the Earth's crust, causing rock and lava to shoot from the volcano in explosive eruptions. Eruptions can cause dangerous flows of lava, ash, mudslides and floods that threaten nearby areas.
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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
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The document provides information about various volcanic and intrusive igneous features including plateaus, shield volcanoes, composite volcanoes, batholiths, sills, dykes, and seismic features such as normal faults and reverse faults. Specific examples discussed include the Deccan Plateau formed by lava flows in India, Mauna Loa volcano in Hawaii demonstrating characteristics of a shield volcano, and Mount St. Helens exhibiting traits of a composite volcano.
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This document describes different types of volcanoes including composite volcanoes, shield volcanoes, cinder cones, and spatter cones. Composite volcanoes are tall and conical, built up from layers of lava and rock fragments. Shield volcanoes are wide and gently sloping due to fluid basaltic lava flows. Cinder cones form steep hills above vents and are built from ejected volcanic fragments. Spatter cones consist of welded together lava clots ejected from vents. The document also discusses volcanic eruptions and their varying impacts.
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Volcanic eruptions occur when magma reaches the Earth's surface through cracks in the crust. They can be devastating in the short term but also beneficial in the long run by enriching soils. Two main types are shield volcanoes, which erupt gently and form low slopes, and composite volcanoes with alternating lava and ash layers that can produce deadly pyroclastic flows. The eruption of Yellowstone supervolcano thousands of years ago was catastrophic globally. Montserrat was devastated in the 1990s when the Soufriere Hills volcano erupted, destroying the capital and forcing mass evacuations, though it has since calmed and rebuilding is underway.
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International migration can have various impacts on both the places people migrate from and to. It can redistribute populations in a way that either reduces or increases spatial differences between dense and sparse areas. Both origins and destinations of migration experience costs and benefits. Migrants often face problems integrating at their destination, like learning a new language or finding housing, while departure points may see strains from losing population. Specific examples discussed include Russian Jews migrating to Israel in the 1950s and 1960s, swelling Israel's population but exacerbating tensions with Palestinians, as well as Turkish guest workers in Germany who faced increasing discrimination and pressure to return home.
Sustainable Development
Sustainable development involves meeting current needs without compromising future generations' ability to meet their own needs. The document discusses sustainable food, water, and environments. It starts by examining sustainable water supply, which is affected by physical factors like geology, relief, and climate; technological issues in water distribution; and political considerations.
Mnt St Helens Interactive Yogi
The document summarizes the 1980 eruption of Mount St. Helens volcano in Washington state. It provides background on the volcano and describes the early signs of increased activity. It explains that magma buildup caused the side of the volcano to bulge outward at a rate of 1.5 meters per day. On May 18th, an earthquake caused the bulge to collapse, resulting in a deadly pyroclastic flow that destroyed an area within 25 square kilometers. The eruption killed 61 people and had significant short and long term environmental effects.
Questions On Kashmir
The Kashmir earthquake caused both primary and secondary effects that led to damage and loss of life. The primary effects were the direct results of the quake such as building collapses. Secondary effects included landslides and fires triggered by damage from the initial quake. The response to the earthquake was coordinated through a joint effort between various relief organizations and the government to provide emergency aid and recovery efforts.
Pate Tectonics
The document discusses plate tectonics and the structure of the Earth. It provides a cross section view of the Earth and introduces the concept of continental drift. It also asks why the plates move.
Limiting The Damage Of Earthquakes
Tiny cracks in rocks near an impending earthquake can be detected using tiltmeters as the cracks fill with water, lowering nearby water levels, and increasing radon gas levels escaping from rocks. Animals also start behaving strangely close to an earthquake. Cities plan by establishing earthquake centers, practicing school drills every 3 months, and reinforcing all buildings. While earthquakes are hard to predict precisely, scientists in China predicted a 1976 quake but were disbelieved when they could not provide an exact date, resulting in 250,000 deaths when a magnitude 7.8 quake hit Tangshan City.
First Lesson
This document provides an overview of natural hazards and introduces plate tectonics as an example. It defines a natural hazard as a natural event perceived as a threat to life and property that can originate within the earth, on its surface, or in the atmosphere. The document then discusses plate tectonics, showing a cross-section of the earth and explaining continental drift and why plates move, before asking students to label plates on a map with their directions of movement.
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- 1. Types of Volcano Starter- Dominoes.
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- 4. Extinct volcano – a volcano which has not erupted for many thousands or millions of years
- 9. 1. How can a Pyroclastic flow cause damage? 4. What might happen to Planes? 6. What impact would a mud flow have? 2. How would trees be effected? 3. What might happen to the sun? 7. What damage could a lava flow do? 8. What would cause roofs to collapse? 9. What could suffocate you? 5. What might happen to crops?