at the end of seafloor spreading, where does the molten rock solidify?\n○ center of the ridge\n○ on the edge…

Brief Explanations:

Seafloor spreading occurs at mid - ocean ridges. Molten rock (magma) rises from the mantle at the center of the ridge. As the seafloor spreads, the new crust moves away from the center. At the end of the spreading process (in terms of the location of solidification relative to the ridge), the molten rock solidifies on the edge of the ridge as the tectonic plates move apart and the new rock is pushed towards the ridge edges. The center of the ridge is where the magma rises initially, not where it solidifies at the "end" of spreading in terms of the position relative to the ridge. Under the new rock or between old rock layers are not the correct locations for the solidification related to the end of seafloor spreading at the ridge context.

Answer:

B. on the edge of the ridge