Ch05_Outline - Chapter 5 Plate Tectonics: A Scientific...

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Chapter 5 Plate Tectonics: A Scientifc Theory UnFolds
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Continental Drift: An Idea Before Its Time Alfred Wegener First proposed his continental drift hypothesis in 1915 Published The Origin of Continents and Oceans Continental drift hypothesis Supercontinent called Pangaea began breaking apart about 200 million years ago
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Pangaea Approximately 200 Million Years Ago Figure 5.2 A
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Continental Drift: An Idea Before Its Time Continental drift hypothesis Continents "drifted" to present positions Evidence used in support of continental drift hypothesis Fit of the continents Fossil evidence Rock type and structural similarities Paleoclimatic evidence
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Matching Mountain Ranges Figure 5.6
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Paleoclimatic Evidence Figure 5.7
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The Great Debate Objections to the continental drift hypothesis Lack of a mechanism for moving continents Wegener incorrectly suggested that continents broke through the ocean crust, much like ice breakers cut through ice Strong opposition to the hypothesis from the scientiFc community
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The Great Debate Continental drift and the scientiFc method Wegener’s hypothesis was correct in principle, but contained incorrect details A few scientists considered Wegener’s ideas plausible and continued the search
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Plate Tectonics: A Modern Version of an Old Idea Earth’s major plates Associated with Earth's strong, rigid outer layer Known as the lithosphere Consists of uppermost mantle and overlying crust Overlies a weaker region in the mantle called the asthenosphere
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Plate Tectonics: A Modern Version of an Old Idea Earth’s major plates Seven major lithospheric plates Plates are in motion and continually changing in shape and size Largest plate is the Pacifc plate Several plates include an entire continent plus a large area oF sea±oor
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Earth’s Plates Figure 5.9 (left side)
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Earth’s Plates Figure 5.9 (right side)
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This note was uploaded on 03/21/2012 for the course GEO 1013 taught by Professor Hefner during the Fall '07 term at Texas San Antonio.

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Ch05_Outline - Chapter 5 Plate Tectonics: A Scientific...

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