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| a weak spot in earths crust where molten material,or magma comes to the surface. |
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a molten mixture of rock-forming substances,gases,and and water from the mantle. |
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| when magma reaches the surface. |
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| a major volcanic belt, formed by the many volcanoes that rim the pacific ocean. |
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| where do volcanoes occur? |
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| Most volcanoes occur along diverging plate boundaries, such as the mid-ocean ridge, or in subduction zones around the edges of oceans. |
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| an area where magma from deep within the mantle melts through the crust like a blow torch. |
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| what happens during a eruption? |
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| during a volcanic eruption, the gases dissolved in magma rush out, carrying the magma with them. |
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| as magma rises toward the surface, it forms a large underground pocket called a magma chamber |
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a long tube in the ground that connects the magma chamber to earths surface. |
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| a material that is formed from the elements oxygen abd silicon, is one of the most anundant materials in earths crust and mantle. |
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| the silica content of magma helps to determine whether the volcanic eruption is quiet or explosive |
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| cooler and slower moving lava |
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| occurs when an explosive eruption hurls out ash,cinders, and bombs as well as gas. |
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| a volcono that is erupting or has shown signs that it may erupt in the near future. |
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| a sleeping volcano. expected to awaken in the future and erupt. |
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| a dead volcano that isnt likely to erupt again. |
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| forms when groundwater heated by a nearby body of magma rises to the surface and collects in a natural pool. |
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| water heated by magma can provide a clean, reliable energy source |
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| althought quiet eruptions and explosive eruptions involve different volcano hazzards, both types of eruption can cause damage far from the craters rim. |
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| Landforms from lava and ash |
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| rock and other materials formed from lava create a variety of landforms including sheild volcanoes, composite volcanoes, cinder cone volcanoes, and lava plateaus. |
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| a steep,cone-shaped hill or mountain. |
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| tall, cone-shaped mountians in whichlayers of lava alternate with layers of ash. |
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| the huge hole left by the collapse of a volcanic nountian. |
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| feautures formed bymagma include volcanic necks,dikes,and sills, as well as batholiths and dome mountains. |
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| forms when magma hardens in a volcanoes pipe. |
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| magma that forces itself across rock layers and hardens |
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| when magma squeezes between layers of rock |
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| a mass of rock formed when a large body of magma colls inside the crust. |
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| like earth, venus has volcanic mountains and other features that are probably made of thin, runny lava. |
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| On mars there are large shield volcanoes similiar to those on venus and earth, as well as cone-shaped volcanoes and lava flows. |
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| volcanoes on distant moons |
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| Io and Triton have volcanic featuresvery diffrent from those on earth,mars,and venus. |
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