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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 of an ancient organism that has been preserved in rock |
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Definition
| The hypothesis that the continents slowly move across Earth's surface |
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| An undersea mountain chain where new ocean floor is produced;a divergent plate boundary |
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Definition
| The process by which molten material adds new oceanic crust to the ocean floor |
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| A devise that determines the distance of an object under water by recording echoes of sound waves |
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Definition
| A deep vally 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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Definition
| A plate boundary where two plates move away from each other |
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