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Plate Tectonics
FOSS Inv. 6 Earth History
Question | Answer |
---|---|
Theory of Continental Drift | Wegner's theory that continents were once connected as one super continent called Pangea. |
Lithospheric plates | large chunks that afloat on the asthenosphere |
Theory of Plate Tectonics | The lithosphere is broken into plates that slowly move. |
Ring of Fire | circle of volcanoes along the Pacific coastlines |
oceanic plate | thinner, but heavier chunks of lithosphere under the ocean. |
continental plate | thicker, but lighter chunks of lithosphere under the continents |
Alfred Wegener | Known for his work with Pangaea and continental drift |
magma | molten rock beneath the Earth's surface. The mantle is mostly this. |
subduction | oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary. |
convergent boundary | the boundary between tectonic plates that are colliding |
divergent boundary | A plate boundary where two plates move away from each other. |
sea-floor spreading | The process by which molten material adds new oceanic crust to the ocean floor |
transform boundary | plates slide past each other |