Sea-Floor Spreading

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In sea-floor spreading, molten material rises from the mantle and erupts

The process by which the ocean floor sinks beneath an deep-ocean trench and back into the mantle is known as

Subduction occurs where the oceanic crust bends down toward the mantle at a(n) ________.

How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?

The scientist credited with sea-floor spreading is _________

Mid-ocean ridges are

The ocean floor sinks beneath a deep-ocean trench and back into the mantle in a process known as ________.

Old oceanic crust is more dense than new oceanic crust because it is