PlateTectonics1 - Plate Tectonics 1Continental Drift Plate...

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Plate Tectonics 1- Continental Drift
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Plate Plate Tectonics Tectonics Unifying concept in geosciences. Introduced in 1960s. Early evidence from rocks and fossils. Later evidence from geophysics and marine geology. Theory
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Plate Tectonics Plate Tectonics Earth’s lithosphere divided into large, rigid plates. Plates move horizontally in response to flow in asthenosphere. Interactions at plate boundaries cause major geologic activity.
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Plate Tectonics Explains: Plate Tectonics Explains: Location of volcanoes and earthquakes. Location of modern and ancient mountain belts. Location of ocean trenches. Evolution and age of ocean basins.
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Continental Drift Hypothesis Continental Drift Hypothesis Alfred Wegener 1915: “The Origins of Continents and Oceans” Pangaea
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The Supercontinent Pangaea (200 million years ago) Pangaea = all lands in Greek
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200 m.y.
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Continental Drift Continental Drift Supporting Data Supporting Data
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Fig. 3.05 W. W. Norton. Modified from Motz.
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PlateTectonics1 - Plate Tectonics 1Continental Drift Plate...

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