world explorations by 1570, european explorers had mapped most of the earth. people looked at these...
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Wegener Alfred Wegener born in Germany Earned a Ph D. in Astronomy, 1904 Interested in geophysics 1911, found a scientific paper listing identical fossils on opposite side of the Atlantic, land bridgesTRANSCRIPT
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World ExplorationsWorld Explorations
• By 1570, European explorers had mapped most of the Earth. People looked at these maps and began to notice, what?
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WegenerWegener
Alfred Wegener born in Germany
Earned a Ph D. in Astronomy, 1904
Interested in geophysics
1911, found a scientific paper listing identical fossils on opposite side of the Atlantic, land bridges
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Looked for examples, additional evidence
Took all his findings & wrote a book.
Published in 1915
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The Theory of Continental The Theory of Continental DriftDrift
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Continental Drift TheoryContinental Drift Theory
• Proposed by Alfred Wegener in 1912• 250 million years ago, all of the continents
were combined into one super-continent called “Pangaea”
• The continents gradually drifted apart to where they are today
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Evidence to Support the TheoryEvidence to Support the Theory
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EVIDENCE WEGENER USED TO EVIDENCE WEGENER USED TO SUPPORT CONTINENTAL DRIFTSUPPORT CONTINENTAL DRIFT
Natural Fit
Fossils
Rocks
Climate Changes
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““Puzzle Pieces”Puzzle Pieces”
• Continents look like they could be part of a giant jigsaw puzzle
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Distribution of FossilsDistribution of Fossils
• Plant and animal fossils found on the coastlines of different continents
• No evidence of a land bridge
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Sequence of RocksSequence of Rocks
• Same rock patterns found in North America and Scotland
• South America, India, Africa, Antarctica and Australia
• Form continuous chain
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Ancient ClimatesAncient Climates
• Tropical plant remains (coal deposits) found in Antarctica
• Glaciation in Africa, South America, India, and Australia during the same time
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Problems With The TheoryProblems With The Theory
• No mechanism for movement of continents
• Wind and currents could possibly move fossils
• Theory was not accepted by scientists