Term
what are the two kinds of volcanoes?
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Definition
| -one kind with violent eruptions producing steep slopes and the other kind with voluminous lava flows producing gentle slopes. |
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Term
| The violence of volcanic eruptions |
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Definition
| -is a function of the viscosity of the lava that erupted. |
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Term
All of the magmas
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Definition
| -contain dissolved volatiles (or gases) that expand and rise buoyantly as the magma rises to the surface—much like the bubbles in a bottle of soda. |
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Term
| Temperature and composition |
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Definition
- determine the viscosity of magma.
-Magma at cool temperatures and with a high silica content is very viscous. |
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Term
| Rhyolitic and andesitic lavas |
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Definition
-examples of lavas with high viscosity.
-They erupt violently, scattering volcanic fragments and ash widely.
-Viscous lava, which does not flow very far, builds steep-sided volcanoes. |
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