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9 Cards in this Set
- Front
- Back
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core |
Dense center of the earth made of solid and melted metals.
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mantle |
Layer of the earth that surrounds the core.
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crust |
Outer layer of the earth.
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continental drift |
Theory that the major landmasses of the earth move. |
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Pangaea |
Single landmass from which Alfred Wegener thought the continents separated millions of years ago. |
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sea-floor spreading |
Theory that the ocean floor spreads apart as new crust is formed at mid-ocean ridges. |
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plate tectonics |
Theory that the earth's surface is made of large sections of crust that move. |
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plate |
Large section of the earth's crust as it moves.
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convection current |
Circular motion of a gas or liquid as it heats. |
