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Plate Tectonics

Everything you need to know about plate tectonics.

Ruth Eberhard

on 20 August 2010

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Transcript of Plate Tectonics

Continental Drift Wegener proposed that the supercontinent, Pangaea, began to break apart 200 million years ago and form the present landmasses. Evidence 1. The Continental Puzzle 2. Matching Fossils - Fossil evidence for continental drift includes several fossil organisms found on different landmasses. 3. Rock Types and Structures -Rock evidence for continental exists in the form of several mountain belts that end at one coastline, only to reappear on a landmass across the ocean.
4.Ancient Climates 5. Matching Mountain Ranges Types of Plate Boundaries Divergent boundaries (also called spreading centers) are the place where two plates move apart Continental Rifts - When spreading centers develop within a continent, the landmass may split into two or more smaller segments, forming a rift East African Rift Valley Convergent boundaries form where two plates move together. A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. Oceanic-Continental Convergent Boundaries Examples include the Andes, Cascades, and the Sierra Nevadas
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