Chapter 13 Vocab
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Created by:
AllanaMillennium on February 22, 2012
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Holt McDouglal Earth Science 2010
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9 terms
Terms | Definitions |
|---|---|
 magma | liquid rock produced under the Earth's surface; igneous rocks are made of magma |
| volcanism | any activity that includes the movement of magma toward or onto Earth's surface |
| lava | magma that flows onto Earth's surface; the rock that forms when lava cools and solidifies |
| volcano | a vent or fissure in Earth's surface through which magma and gases are expelled |
| hot spot | a volcanically active area of Earth's surface, commonly far from a tectonic plate boundary |
| mafic | describes magma or igneous rock that is rich in magnesium and iron and that is generally dark in color |
| felsic | describes magma or igneous rock that is rich in feldspars and silica and that is generally light in color |
| pyroclastic material | fragments of rock that form during a volcanic eruption |
| caldera | a large, circular depression that forms when the magma chamber below a volcano partially empties and causes the ground above to sink |
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