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8.1 7th grade plate
8.1 plate boundaries and Tectonic movement
| Question | Answer |
|---|---|
| mid-ocean ridge | a group of underwater volcanoes that wrap around the globe this is a divergent plate boundary, new ocean floor is created as spreading happens |
| sea-floor spreading | magma, molten rock, rises from the mantle to the crack in the Earth's crust and hardens to create new oceanic crust |
| Subduction | sinking movement of ocean floor back into the mantle |
| ocean trench | under sea valleys have the ocean crust subduct under the continental crust |
| continental drift | Wagner's scientific theory that Earth's continents were once joined in a supercontinent called Pangaea |
| plate tectonics | Earth's lithosphere broken into plates that are in constant motion moving in a specific pattern at the plate boundaries |
| Pangaea | all the continents are in one big supercontinent then the breaking apart happend |
| divergent boundary | plates move apart or away from each other in opposite direction |
| transform boundary | plates slip past each other along boundaries |
| convergent boundary | plates come together along boundaries |
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