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| A deep valley that forms where two plates move apart |
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| a plate boundry where two plates move toward each other |
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| a plate boundry where two plates move away from each other |
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| A platr boundary where two plates move past each other |
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| The process of which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary. |
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| A deep,steep-sided canyon in the ocean floor. |
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| Mountains whose peaks do not break the sufarce of the ocean water above them |
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| When volcanoes on the ocean floor erupt, the can create mountains whose peals break the surface of the ocean. As the lava cools island forms |
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| The process by wich molten material adds new oceanic crust to the ocean floor |
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| A smooth, nearly flat region of the deep ocean floor. |
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| An undersea mountain chain where new ocean floor is produced |
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| A device that determines the distance of an object under water by recording echos of sound waves |
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| A gently sloping, shallow area of the ocean floor that extends outward from the edge of a continent |
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| A steep incline of the ocean floor leading down from the edge of the coniintetal shelf. |
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