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8 Cards in this Set
- Front
- Back
mid-ocean ridge
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long chains of mountains that rise up from the ocean floor
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sonar
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using sound waves to measure the distance to an object
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sea-floor spreading
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adds more crust to the ocean floor and older strips of rock move outward from either side of the ridge
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evidence from ocean material
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rocks shaped like pillows from the central valley of a mid-ocean ridge
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evidence from magnetic stripes
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molten material that erupted and hardened while Earth's magnetic poles did not change that match those on opposite sides of the mid-ocean ridge
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evidence from drilling samples
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rock samples farther from the mid-ocean ridge are older and those closer to it are younger
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deep-ocean trench
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deep under water canyons
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subduction
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process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle
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