Which statement explains what happens to older crust during seafloor spreading? it is destroyed at coastlines. it moves under continents. it is destroyed at a mid-ocean ridge. it moves away from a mid-ocean ridge.

It moves away from the mid ocean ridge.

The 4th option is the correct one.

Explanation :

Seafloor spreading occurs at mid-ocean ridges where new oceanic crust is formed and then gradually moves away from the ridge.

So, the last statement explains what happens to older crust during seafloor spreading. It moves away from a mid-ocean ridge.

the answer is b.) hydrogen bonds between bases.

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