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12 Cards in this Set
- Front
- Back
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Continental Drift Theory |
Alfred Wegener proposed this theory It states that continents have not always been in their present locations but have "drifted" there over millions of years |
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First evidence for continental drift |
-South America & Africa looked as if they would fit together like puzzle pieces -This supercontinent was called "Pangaea" |
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Clues from Vegener's theory |
-Matching fossils -Paleoglaciation -large coat deposits in the Antarctic
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Tectonic Plates |
Large slabs of the earth's crust , which slide overtop of molten rock |
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Layers of Earth |
-Crust/Lithosphere -Mantle -Outer Core -Inner Core |
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Lithosphere |
Continental rock is the least dense of all rock(Granite) Oceanic crust is more dense (Basalt) |
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Upper Mantle |
Thickest layer, semifluid 660km |
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Lower Mantle |
2225km solid |
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Outercore |
Liquid iron & nickel 2270km |
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Inner Core |
Mostly iron, but solid due to pressure 1216km |
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Plate Motion |
Lithosphere floats on the upper mantel/ atenosphere moves due to convection current in the upper mantle |
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4 Test for PTT |
Mid-atlantic Ridge: in the middle of the Atlantic there is an underwater mountain range bc of the splitting of the crust Mid-atlantic Ridge: the closer we are to the ridge ,the younger the rock Paleomagnetism: study of old magnetic particles in the rock Hotspots |
