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Sea-Floor Spreading

Inside Earth: Chapter One, Section Four

TermDefinition
mid-ocean ridge the undersea mountain chain where new ocean floor is produced; a divergent boundary
sonar a device that determines the distance of an object under water by recording echoes of sound waves.
deep-ocean trench a deep-valley along the ocean floor through which oceanic crust slowly sinks towards the mantle.
sea-floor spreading the process by which molten material adds new oceanic crust to the ocean floor.
subduction the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
magnetic evidence patterns in rocks in the ocean floor show that the magnetic fields have reversed themselves.
drilling sample evidence rock samples show that the rocks further away from the mid-ocean ridge are older, and those closer to the ridge are younger.
Created by: wtr6thscience
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