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| Question | Answer |
|---|---|
| Volcano | Weak spot in the crust where molten material, or magma comes to the surface |
| Magma | Magma is a molten mixture of rock-forming substances, gases and water from the mantle. |
| Lava | When magma that has reached the surface. |
| Ring of Fire | Belt of volcanoes that circles the Pacific Ocean |
| Where do most volcanoes occur? | Most volcanoes occur along diverging plate boundaries, such as the mid-ocean ridge, subduction zones around edges of oceans, and hot spots. |
| What happens along the mid ocean ridge (diverging plate boundary)? | Lava pours out of cracks in the ocean floor. |
| Volcanoes at converging plate boundaries | Subduction causes slabs of oceanic crust to sink through a deep-ocean trench into the mantle. The crust metls and forms magma. The melted crust errupts as lava. |
| What is an island arc? | The curve of the island arc ( a sting of islands) matches the curve of its deep open trench. |
| What can collisions between oceanic and continental plates produce? | volcanoes of the Andes Mountains and volcanoes of the Pacific NW of the US. |
| What causes hot spot volcanoes to form? | Magma from deep within the mantle rises and melts through the crust above it, often far from plate boundaries. |
| How does magma reach the Earth's surface? | Liquid magma is less dense than the surrounding solid rock, so it floats up through the cracks and to the surface. |
| What happens during a volcanic erruption? | Gases dissolved in magma rush out. Once magma reaches the surface it becomes lava and then the gases bubble out. |
| Crater | Lava collects in the crater, the bowl-shaped area that forms around the volcanoes vent. |
| Vent | The point on the surface where magma leaves the volcano's pipe |
| Lava | Magma that reaches the Earth's surface. |
| Magma | Magma is extremely hot, molten material that also contains gases including water vapor. |
| Side Vent | Sometimes magma forces its way out of the volcano through a side vent. |
| Force of a volcanic eruption | Depends partly on the amount of ga dissolved in the magma |
| Silica | Material formed from oxygen and silicon. The more silica magma contains, the thicker it is. |
| The silica cpntent determines | whether the eruption is quiet or explosive |
| Quiet eruptions produce two kinds of lava | aa and pahoehoe |
| If magma is thick and sticky... | volcano eruption is EXPLOSIVE |
| If I study these cards I will do well on the test? | NO...these are only a few cards and I strongly suggest you review your vocabulary terms and worksheets that have been returned! These cards cover a small section of the test. GOOD LUCK!!!You can do it!!! |
Created by:
JWhite
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