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Chapter 18 Review
Earth Science
| Question | Answer |
|---|---|
| What are volcanoes fueled by? | All volcanoes are fueled by magma deep within the Earth's crust. |
| What are three factors that affect the formation of magma? | 1.Temperature 2.Water Content 3.Pressure |
| What does temperature do as depth increases? What does pressure do? | With depth pressure increases, the temperature at which a substance melts also increases. |
| What are three types of magma? Give the relative viscosty of each and the type of eruption each usually fuels. | 1.Basaltic magma-viscosity low-eruption type least explosive...ooze-y 2.Andesitic magma-viscosity intermediate-eruption type-intermediate 3.Rhyolitic magma-viscosity high-eruption type-greatest explosiveness |
| How does silica content affect the viscosity of magma? | The amount of silica in magma increases its viscosity. |
| How does the viscosity of magma relate to the relative violence with which a volcano erupts? | Higher viscosity = More violence |
| What are three ways magma can interact with the overlying crust? | 1.Wedge into it 2.Melt it 3.Break pieces off |
| What are plutons? | When magma cools, minerals form. Over a very long period of time, these minerals will combine to form intrusive igneous rock bodies, or rock formations that formed underground from magma, are called plutons. |
| What are batholiths and stocks? | Both are irregular shaped plutons. Batholiths are the biggest pluton, and stocks are similar but are smaller in size. |
| What are laccoliths? | A mushroom shaped pluton w/ a round top and a flat bottom. |
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