Question

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.

Explanation:

Seafloor spreading occurs at mid-ocean ridges, where new crust forms. As new crust is created, older crust is pushed away from the ridge. Older crust is destroyed at subduction zones (not coastlines or mid-ocean ridges), and it does not move under continents as a direct result of seafloor spreading.

Answer:

D. It moves away from a mid-ocean ridge.