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21 Cards in this Set
- Front
- Back
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When tectonic plates ____, it entrains a lot of water with the downwardly thrusting plate, which facilitates the production of liquid rock called ____. |
converge magma |
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Plate convergence & subduction can occur when two ____ plates meet or when an ____ plate & a ____ plate meet. |
oceanic oceanic, land |
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Plate convergence can make a volcanic ____ on land or in the ocean. The ones in the ocean are called ____ volcanic ____, because they form new land. |
arc island, arc |
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When a plate moves over a hot spot, volcanoes blow holes in the plate, making a chain of volcanoes. These are called ____ volcanoes. |
intraplate |
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"Intra" in Intraplate means ____ the plate. |
within |
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The Hawaiian islands are an example of ____ volcanoes |
intraplate |
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Iceland is an island country that sits on the Mid-Atlantic rift zone, which is loaded with volcanoes, but these volcanoes are formed from the _____ of plates, whose decompression allow magma to rise upward from the crack. |
divergence |
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Fast-moving, ropy-looking lava is called ____. |
paehoehoe |
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Slow-moving, thick lava is called ____. |
aa |
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While rock is molten underground, it's called ____. |
magma |
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Molten rock that has emerged from a volcano is called ____. |
lava |
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Material ejected from volcanoes is collectively called ____ material. |
pyroclastic |
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Much of the pyroclastic material from volcanoes is called ____ & consists of dust, ash, and ____, which are like small rocks. |
tephra lapilli |
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Water vapor, carbon dioxide, and ____ -a very noxious, choking substance are some gases from volcanoes. |
sulfur dioxide |
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Sulfur dioxide helps create ____ that block sunlight and hence have a ____ effect on the planet. |
clouds
cooling |
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When a volcano erupts repeatedly over many years, it gets ____ and wider, as it builds layers. |
taller |
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The reason that magma rises from underground is that.... |
it's less dense than the surrounding rock, since it has a lot of gases in it. |
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An important benefit of volcanoes is that they _____ when lava pours into the ocean. |
make new land |
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People like to live and farm the land around volcanoes because..... |
the soil is rich in nutrients for agriculture. |
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In states or countries where there is volcanic activity, the heat from underground can be harnessed to make.... |
geothermal energy (electricity &/or heat for buildings) |
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The 3 main places where we see volcanoes occur are at.... |
convergent/subduction zones divergent/rift zones intraplate hot spots |
