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| the undersea mountain chain where new ocean floor is produced ;is a divergent plate boundary. |
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| a deep valley along the ocean floor through witch oceanic crust slowly sinks toward the mantle |
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| the process by witch molton material adds new oceanic crust to the ocean floor. |
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| a geological process in which one edge of a crustal plate is forced sideways and downward into the mantle below another plate |
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| a valley with steep sides; formed by a rift in the earth's crust |
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Definition
| the branch of geology studying the folding and faulting of the earth's crust |
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