In places where seafloor spreading is occurring, you would expect to a. a mid-ocean ridge. b. an oceanic trench. c. volcanoes. d. both a. and c.

The correct answer is D.
Seafloor spreading is a process of creating seafloor crust out of volcanic materials that are emerging from the Earth's core at the mid-ocean ridges.
This is made possible by the moving of Earth's tectonic plates.

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