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12 Cards in this Set
- Front
- Back
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What did Alfred Wegener propose?
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The continental drift hypothesis in 1915
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What book did Wegener publish?
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The Origin of Continents and Oceans
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What is the continental drift hypothesis?
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A supercontinent called Pangaea began breaking apart about 200 million years ago
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In the Continental drift hypothesis the continents did what?
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drifted to their present positions
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What is some supporting evidence for the Contintental drift hypothesis?
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1. the fit of the continents
2. fossil evidence 3. rock type and structural similarities 5.paleoclimatic evidence |
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What is one main objections to the continental drift hypothesis?
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Lack of a mechanism for moving continents - a good hypothesis must be consistent with the basic principles of physics
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How did Wegener inncorrectly suggest that continents broke through the ocean crust?
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Must like ice breakers cut through ice
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What particular part of the scientific community had strong opposition to this hypothesis?
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among American scientists
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Who came up with the Seafloor spreading hypothesis?
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Harry Hess early 1960's
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What heavy igneous rock dominates the crust beneath the oceans
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basalt
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what does the basalt igenous rock make up?
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the oceanic crust
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The continental crust is largely composed of...
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granite
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