Question

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what happens when the seafloor spreads?
new crust moves away from the mid - ocean rift.
basalt cools to form a new crust near the mid - ocean rift.
new crust forms near the continental slope.
old crust moves closer together.

Explanation:

Seafloor spreading occurs at mid - ocean ridges. Magma (basalt) rises from the mantle, cools, and forms new oceanic crust. The new crust then moves away from the mid - ocean rift. Continental slopes are not the site of new crust formation in seafloor spreading. Old crust does not move closer together in seafloor spreading; instead, it is pushed away as new crust forms.

Answer:

Basalt cools to form a new crust near the mid - ocean rift.