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| areas where plates move away from each other. (Mid Ocean Ridge; rift valleys) |
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| a lowering in elevation or land. |
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| plates that move towards each other, the compressional force will make folded mountains. |
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| a supercontinent that existed 225-260 million years ago. A large land mass formed by all the continents together. Greek origin meaning "all lands." |
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| Theory of Plate Tectonics |
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| states that the earth is made of up of several rigid plates that move on the asthenosphere. |
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| a theory stating that the Earth's continents have been joined together and have moved away from each other at different times in earth's history. |
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| a process in which new ocean floor is created as molten material from the earth's mantle rises in margins between plates or ridges and spreads out. |
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| currents caused by the expansion of a liquid, solid , or gas as temperature rises. |
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| something that points out or shows a limit or an end: dividing line. |
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| region where two points meet. |
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| occurs where two plates grind past each other. |
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| an opening made by splitting and separation |
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| raised or elevated part of the area |
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| a deep depression of the sea floor caused by the subduction of one plate under another (convergent) |
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| a break or crack in the earth's surface. |
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| an idea that is the best explanation of many observations and helps make new predictions. |
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