SKKH+1.4

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1.4 Sea-Floor Spreading Notes
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Vocabulary
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 * mid-ocean ridge**-the longest chain of mountains in the world
 * sonar**-device that bounces sound waves off underwater objects and then records the echoes off these sound waves.
 * Deep-Ocan trenches**-deep underwater canyons
 * Subduction**-the process by which the ocean floor sinks beneath a deep-ocean trench and then back into the mantle.

Evidence from sea-floor spreading

 * Evidence from molten material
 * Evidence from magnetic stripes
 * Evidence from Drilling samples

Subduction and Earth's Oceans

 * Subduction in the Pacific Ocean
 * Subduction in the Atlantic Ocean