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Science Test Review
Chapter 3
| Question | Answer |
|---|---|
| What do geysers do? | They erupt hot steam and water. |
| How do calderas form? | After an eruption, the volcanic mountain collapses. |
| What impact does silica have on magma? | The amount of silica determines the thickness of the magma. |
| What and where is the Ring of Fire? | It is a major belt of volcanoes surrounding the Pacific Ocean. |
| What is magma? | It is hot molten rock beneath the surface. |
| What descriptions refers to a pyroclastic flow? | It is explosive and consists of ash, cinders, and bombs. |
| What is a volcano? | It is a weak spot in the crust where magma come out from. |
| How does a volcanic neck form? | It forms when hardened magma inside the pipe never erupts and the surrounding volcano weathers away. |
| What makes volcanic soil so fertile? | It is full with nutrients, minerals, and rich in potassium and phosphorus. |
| How does a lava plateau form? | It forms when thin, runny lava escapes through long, narrow openings. |
| What are the 3 volcanic types and how do they form? | 1. Shield-repeated lava flows during quiet eruptions gradually build up a broad, gently sloping volcanic mountain. 2. Cinder Cone-when cinders erupt explosively from a volcanic vent, they pile around the vent, forming a cone-shaped hill. |
| 3. | Layers of lava alternate with layers of ash, cinders, and bombs. Has both quiet and explosive eruptions. |
| What makes a volcano active or dormant. | A volcano is active when it could erupt at anytime. When the volcano is dormant, it is not expected to erupt anytime soon. |
| Why does magma rise through the crust? | Because it's less dense that surrounding solid rock. |
| Pahoehoe and aa come from what kind of eruptions? | They both come from quiet eruptions. |
| What is inside a magma chamber? | Inside is magma. |
| What is geothermal energy and how is it used? | Magma heats groundwater and it is used for home heating and electricity. |
| How does a batholith form? | Giant slabs of hardened magma inside the crust lie horizontally. |
| What are the 3 factors for the thickness of magma? | Silica content, gas content, and temperature. |
| Where is a hot spot? | Away from a boundary near the middle of a plate. |
Created by:
ilievam969
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