which is the first step in the seafloor spreading process? a crack forms in oceanic crust. volcanoes erupt…

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.

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.

Answer

Brief Explanations:

Seafloor spreading starts with a crack forming in the oceanic crust. This allows magma to rise. Eruptions and magma - rise occur after the crack forms. Subduction is part of plate - tectonics but not the first step of seafloor spreading.

Answer:

A. A crack forms in oceanic crust.