Term
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Definition
| continents drifted to current location (from Pangaea) |
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Term
| Who first proposed the Continental Drift? |
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Definition
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Term
| What problems did Alex Wegener have with his theory? |
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Definition
1. No proof
2. No explanation to how it happened |
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Term
| Name the three main artifacts that helped support Alex Wegener's theory? |
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Definition
1. Fossil clues- similar plant and animal fossils found on both sides of the Atlantic
2. Climate clues- Glacial evidence in warmer climates and fossils of ferns in cold climates
3.Rock clues- similar rock types found on both sides of the Atlantic Ocean |
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Term
| What causes seafloor spreading |
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Definition
| molten rock pushed through at mid-Atlantic Ridge |
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Term
| Who proposed Seafloor spreading? |
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Definition
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Term
| What are the two pieces of proof Hess had? |
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Definition
1. Newer rocks near mid-Atlantic ridge
2. Magnetic clues in rocks |
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Term
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Definition
| crustal sections (plates) moves around on mantle |
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Term
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Definition
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Term
| 2 things about plate tectonic theory |
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Definition
| plates move by convection currents and 13-14 major plates |
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Term
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Definition
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Term
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Definition
| two continental (less dense) plates collide (ex. - India & Asia) |
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Term
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Definition
| denser oceanic plate goes under less dense continental plate (ex. - California coast) |
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Term
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Definition
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Term
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Definition
| two oceanic plates move apart (ex. - mid-Atlantic ridge |
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Term
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Definition
| two continental plates move apart (ex. - E. Africa rift valley) |
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Term
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Definition
plates slide by each other
ex.- San Andreas fault (California) |
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