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| The longest chain of mountains in the world, which is mostly under water |
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| a device that bounces waves off underwater objects and then records their echoes of the sound waves. |
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| the process by which molten materials 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 toward the mantle. |
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| the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle. |
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| a well-tested concept based on many observations |
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| geological theory that states that pieces of the earth’s lithosphere are constantly in slow motion, which is driven by convection currents in the mantle. |
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| a section of the lithosphere that slowly moves from the magma chamber to Earth's surface. |
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| a break in Earth's lithosphere along which the rocks move. |
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| where the edges of different pieces of the lithosphere meet. |
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| a place where two plates slip past each other moving in opposite directions |
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| Place where two plates move apart (separate) |
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| a deep valley that forms where two plates move apart |
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| a place where two plates come together. |
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| the hypothesis that the continents slowly move across the Earth's surface |
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| any trace of an ancient organism that has been preserved in rock. |
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