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8 Cards in this Set
- Front
- Back
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What is a tsunami? |
It is formed when the sea floor moves abruptly. It is usually caused by an earthquake but can also be caused by volcanoes. |
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How do volcanoes form? |
Volcanoes form around vents from the oceanic crust that release magma into the earth's surface. |
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What are the 2 different types of volcano eruptions? |
Nonexplosive and explosive. |
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What causes volcanoes? |
From divergent plates, under the ocean, subduction zones, hot spots such as Hawaii. |
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The composition of magma determines whether it is explosive or not. What does high water content mean? |
It is likely to be explosive. |
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High silica content in magma makes it more likely to be explosive. Why? |
Silica has a thick, stiff consistency, flows slowly, and tends to harden in the volcano's vent. |
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What erupts from a volcano? |
Pyro clastic material, rock fragments created by explosive eruptions, magma explodes from volcanoes and solidifies in the air, material is called tephra once it hits the ground. |
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How do volcanologists predict eruptions? |
Measuring small quakes, measuring slope, measuring volcanic gases, measuring temperature from orbit |
