an undersea mountain chain where new ocean floor is produced at a divergent plate boundary

a device that determines the distance of an object under water by recording echoes of sound waves

the process by which molten material adds new oceanic crust to the ocean floor

Hess' evidence to support sea-floor spreading

eruptions of molten material, magnetic stripes, ages of rocks

a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle

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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by lmccartin, Jul. 2013

Subjects: earth science vocabulary

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	mid-ocean ridge	an undersea mountain chain where new ocean floor is produced at a divergent plate boundary
	sonar	a device that determines the distance of an object under water by recording echoes of sound waves
	sea-floor spreading	the process by which molten material adds new oceanic crust to the ocean floor
	Hess' evidence to support sea-floor spreading	eruptions of molten material, magnetic stripes, ages of rocks
	deep ocean trenches	a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
	subduction	the process by which oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary