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22 Cards in this Set
- Front
- Back
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Asthenosphere |
Layer that is made up of a material that acts like both a solid and a liquid |
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Convection Currents |
Large circular patterns of magma movement inside the Earth that drive the movement of the plates |
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Seafloor Spreading |
The process by which molten material adds new oceanic crust to the ocean floor |
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Divergent |
Type of boundary formed when two plates move apart |
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Continental Crust |
Light, low density crust made up of granite |
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Oceanic Crust |
Heavy, dense crust made primarily of basalt |
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Lithosphere |
Outer layer of the Earth made up of the crust and upper part of the mantle |
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Subduction |
The process by which oceanic crust sinks back into the mantle to be destroyed |
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Mid-Ocean Ridge |
Large, volcanic mountain chains that run all along the centers of the ocean floor like the seams of a baseball |
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Convergent |
Type of boundary where plates move towards one another |
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Transform |
Type of boundary where plates on either side of the boundary slide past one another |
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Trench |
Deep crack in the Earth's surface that occurs when one plate subducts under another |
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Rift Valley |
Deep valley located between the mid-ocean ridges and created by divergence |
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Convection currents |
The process of heat transfer inside the Earth that makes plate tectonics function |
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Magnetic Stripes |
Bands of iron rich rock that show evidence of switching magnetic poles over the course of history |
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Convergent O-O |
Small earthquakes, large earthquakes, volcanoes, and island arcs |
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Small earthquakes, large earthquakes, and mountains |
Convergent C-C |
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Small earthquakes, large earthquakes, and volcanoes |
Convergent O-C |
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Small earthquakes and volcanoes |
Divergent |
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Small and large earthquakes |
Transform |
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Why do most volcanoes exist? |
Subduction of one plate under another creates volcanoes at O-O and O-C boundaries |
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Evidence for seafloor spreading |
Pillow basalts/molten material, magnetic stripes, and age of rocks |
