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Related Flashcards
Cards In This Set
| Front | Back |
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What is the theory of Plate tectonics?
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a theory that describes the formation, movements, and interactions of plates
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Plates
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the broken up lithosphere that moves on the asthenosphere
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Alfred Wegner?
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german scientist who proposed the idea of Continental Drift.
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Continental Drift
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the idea that the plates move around the earth
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Proof of Continental Drift
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-Continents look like puzzle peices
-Mesosaurus found in both SA and Africa
-disitinctive rock formations on both contitents
-climate change evidence
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Wegners Idea of how they Drifted
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The continents were less dense and floated on the ocean
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What is located at the center of a mid-ocean trench?
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a rift valley
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Where does ocean floor return to the earth's interior
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at subduction zones, trenches
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 The process where one plate goes under another is called _________________ |
subduction
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3 theories how plates move
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 1. Mantle Convection 2. Ridge Push 3. Slab Pull |
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Mantle Convection
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 hot "soft" rpcl roses, cools then sinks. Rock is then heated and rises again. Mantle moving plates along as is convects |
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Ridge Push
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 material slides down mid-ocean ridge into asthenosphere. Heated rock expands becomes elevated, produces slope then cooks, ocndences and slides down. |
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Slab Pull
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 gravity pulls edge of a cool dense plate into asthenosphere. Denser, heavier plate subducts and drags the rest of the plate with it |
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What forms when two plates collide?
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folded mountains
deep-sea trenches
volcanic islands
volcanic islands
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 What kind of collisions is this and what does it make? |
continent-continent
folded mountains
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