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| Gaps in the crust are produced and large slabs of rock slide and sink down into the gaps |
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| perserved record of the changes in earths magnetism over geologic time |
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| sloping platform between shoreline and steep slope of ocean floor |
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| constantly renewed seafloor, convection cells in mantle |
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| earth's outer shell, the lithosphere, is divided into eight large plates and a number of smaller ones |
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| 3 types of plate boundaries |
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| divergent, convergent, and transform fault |
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| pangaea, contintental shelf |
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