What effect does subduction and sea floor spreading have on the earth's surface?

What effect does subduction and sea floor spreading have on the earth's surface?
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It allows the continents to move relative to each other.
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What prominent feature of the ocean floor is missing from the Sea Floor Spreading Model at this point?

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What forms when one oceanic plate is forced beneath another plate a rift valley an ocean basin an ocean ridge a subduction zone?

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