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3
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the hypothesis that the continents slowly move across earth's surface
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4
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a plate boundary where two plates move away from each other
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5
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a type of fault in which rocks on either side move past each other sideways with little up or downward motion
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6
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the process by which molten material adds new oceanic crust to the ocean floor
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7
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a plate boundary where two plates move past each other in the opposite direction
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8
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an undersea mountain chin where new ocean floor is produced ;divergent plate boundary under the sea
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9
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stress that squeezes until it folds or breaks
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12
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a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
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17
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the name of the single landmass that began to break apart 200 years ago and gave rise to todays continents
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18
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a deep valley that forms where two plates move apart
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