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| The hypothesis that the continents slowly move across Earth’s surface. |
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| The name of the single landmass that broke apart 200 million years ago and gave rise to today’s continents. |
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| A trace if an ancient organism that has been preserved in rock. |
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| An 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 ocean crust to the ocean floor. |
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| A valley along the ocean floor beneath which oceanic crust slowly sinks toward 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 asthneosphere, 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 current in the mantle. |
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| A break in Earth’s crust where masses of rock slip past each other. |
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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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| A plate boundary where two plates move last each other in opposite directions. |
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