Question

at the end of seafloor spreading, where does the molten rock solidify?
center of the ridge
on the edge of the ridge
under the new rock
between the old rock layers

Explanation:

Seafloor spreading occurs at mid - ocean ridges. Molten rock (magma) rises up from the mantle and solidifies at the center of the ridge to form new oceanic crust.

Answer:

center of the ridge