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23 Cards in this Set
- Front
- Back
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How do volcano's change Earth's surface?
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Create landforms through lava, ash and other materials
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Why do so many of Earth's volcano's occur along plate boundaries?
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Because subduction takes place
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What is the difffernce between magma and lava
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Magma is below the surface and lave is above the surface
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What is a volcano
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Magma comes to the surface
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What is a ring of fire
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A major volcanic belt formed by many volcanos
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What is an island arc?
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The result of volcanoes causing a string of islands
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What is a shield volcano?
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Layers that are wide and gently sloping into a mountain.
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What is a cinder cone?
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Materials from a volcano that pile up around the vent, forming a steep, cone shaped hill
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What is a composite volcano?
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Layers from a tall, cone shaped mountain.
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What is a caldera?
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Huge hole left by the collapse of a volcanic mountain.
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What is a geyser?
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Fountain of water and steam that erupts from the ground
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What is geothermal activity?
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Magma a few kilometers beneath earth heats umdergound water.
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What are two types of geothermal activity?
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Hot springs and geysers
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What forms when magma forces itself across rock layers and hardens?
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DIKE
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What forms when magma squeezes between layers of rock and hardens?
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SILL
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When magma reaches the surface it is called?
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LAVA
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When lava cools what does it form?
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Solid Rock
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Volcanoes occur where what is subducted beneath a continental plate?
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Oceantic Plate
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What two things happen when at Plate Boundaries?
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Diverge (pull apart) and Converge (push together)
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Some volcanoes result from "hot spots" in what?
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Earth's Mantle
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What forms at the boundaries of earth's plates?
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Volcanic Belts
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What is a "HOT SPOT"?
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Is an area where material from within the mantle rises and then melts
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What is a molten mixture of rock forming substances, gases and water from mantle?
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MAGMA
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