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| the undersea mountain chain where new ocean floor is produced; a divergent plate boundary |
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| a device that determines the distance of an object under water by recording echoes of sound waves |
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| the process by which molten material adds new oceanic crust to the ocean floor |
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| a deep valley along the ocean floor through which oceanic crust slowly sinks towards the mantle |
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| the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary |
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| a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust |
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| a well-tested concept that explains a wide range of observations |
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| the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle |
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| a break in Earth's crust where slabs of rock slip past each other |
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| a plate boundary where two plates move past each other in opposite directions |
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| a plate boundary where two plates move away from each other |
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| a deep valley that forms where two plates move apart |
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| a plate boundary where two plates move toward each other |
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