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Description
Flashcards by Sarah Mercer, updated more than 1 year ago
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Created by Sarah Mercer
over 8 years ago
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| Question | Answer |
| Destructive plate boundaries - Volcanoes | When two plates move together the oceanic crust is pushed under the continental crust to form a subduction zone. The continental crust is buckled to form a mountain range. The oceanic crust melts to make magma and this magma rises to crack through crust to form new volcanoes. |
| Destructive plate boundaries - earthquakes | As the plates move against each other pressure builds up. A sudden movement of a plate causes the pressure to be released in the form of an earthquake. |
| Destructive plate boundaries - diagram | |
| Conservative plate boundaries | When two plates move sideways against each other no new crust is formed therefore very few volcanoes are formed, however earthquakes are strong and frequent. The plates may lock together as they move and build up pressure. This pressure sends shock waves up to the surface |
| Conservative plate boundaries - diagram | |
| Constructive plate boundaries | When two plates move away from each other new crust is formed and magma rises from the mantle. There are frequent volcanic eruptions that form large ridges above the ocean floor (mid-ocean ridges). |
| Constructive plate boundaries - diagram |
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