WILL MARK BRAINLIEST IF CORRECT Which is the first step in the seafloor spreading process?

A crack forms in oceanic crust.
Volcanoes erupt under the ocean.
Molten rock rises up through the crust.
Dense plates are subducted under less dense plates.

A crack forms in oceanic crust .

Explanation:

Sea-Floor Spreading begins at a mid-ocean ridge, which forms along a crack in the oceanic crust. along the ridge, molten material that forms several kilometers beneath the surface rises and erupts. at the same time, older rock moves outward on both sides of the ridge.