Which of the following correctly describes seafloor spreading?

ANew oceanic crust is formed at midocean ridges, pushed away from the ridge, and destroyed at deep-sea trenches.

BNew oceanic crust is formed at seamounts and spreads outward in all directions.

CNew oceanic crust is formed at deep-sea trenches, pushed away from the trench, and destroyed at midocean ridges.

DNew oceanic crust is formed in the middle of tectonic plates and then spreads outward in bands.

Option D correctly describes seafloor spreading. Seafloor spreading is a process which typically occur at middle ocean ridges where new oceanic crusts are formed as a result of volcanic activity. These oceanic crusts then gradually move away from the ridge.

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Diatonic254 Diatonic254 · Answer 2 · 2018-07-31T09:30:48-04:00

The answer is B. This occurs at mid-ocean ridges, where two tectonic plates are moving away from each other. As they move in opposite directions, the magma from the mantle below rises to fill the void/space left above. As the magma rises, it cools and forms a new crust. This volcanic activity continues as long as the tectonic plates are moving away from each other and new crust is formed spreading outwards from the ridge, with time.