Plate Tectonics I

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Plate Tectonics I

• Shifting plates

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Leonardo da Vinci
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Charles Darwin
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Alfred Wegener
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Parallelism of Continental Margins
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Pangaea Super-continent 250 million years ago
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Similar Fossils on Continents far apart
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Similar Mountains Across Continents
Norway
USA
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Glacial Features on warm Continents
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How Plate Tectonics Was Rediscovered
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Magnetism Curie Point Magnetite
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Seafloor is like a magnetic tape
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Magnetic Record
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Ocean Sediment
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Ocean Floor Age
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The Basic Idea of Plate Tectonics
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Major Tectonic Plates
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TBC.