Why do you think that old rocks are rare on the ocean floor

Question

Biology

Scout

21 May, 00:19

Why do you think that old rocks are rare on the ocean floor

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Answers (2)

Know the Answer?

Janiah · Answer 1

It is believed that old rocks are rare on ocean floors because the floor has many remains and we are not unable to reach them.

Preston Reed · Answer 2

At the mid-ocean ridges, lava is pushing the sea floor away from the ridge on each side. Eventually that part of the seafloor will be subducted under a continental plate at a convergent boundary. That means that the seafloor is constantly being renewed. The newest rocks will be found closest to the mid-ocean ridge and the oldest the greatest distance from the mid-ocean ridge.

The oldest rock found beneath the ocean dates back only about 200 million years.

However, the rock underlying the continents is as much as four billion years old.