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| continents drifted to current location (from Pangaea) was proposed by Wegener |
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| No explanation how it happened |
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| similar plant and animal fossils found on both sides of the Atlantic Ocean |
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| Glacial evidence in warmer climates |
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| similar rock types found on both sides of the Atlantic Ocean |
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| molten rock pushed thru at the mid-Atlantic Ridge was proposed by Hess in 1960 |
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| Fossils of ferns in cold climates |
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| newer rock near mid-Atlantic Ridge |
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| crustal sections (plates) move around mantle |
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| two continental (less dense) plates collide (Ex.- India & Asia) |
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| Denser oceanic plate goes under less dense continent plate (Ex.- California coast) |
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| two oceanic plates move apart (Ex.- mid-Atlantic ridge) |
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| two continental plates move apart (Ex.- E. African rift valley) |
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| plates slide by each other ex- San Andreas fault (California) |
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