which is the first step in the seafloor spreading process?\n\na crack forms in oceanic crust.\nvolcanoes…

which is the first step in the seafloor spreading process?\n\na crack forms in oceanic crust.\nvolcanoes erupt under the ocean.\nmolten rock rises up through the crust.\ndense plates are subducted under less dense plates.

which is the first step in the seafloor spreading process?\n\na crack forms in oceanic crust.\nvolcanoes erupt under the ocean.\nmolten rock rises up through the crust.\ndense plates are subducted under less dense plates.

Answer

Brief Explanations:

Seafloor spreading is a geologic process that occurs at divergent plate boundaries. The process begins when tectonic plates move apart, creating a rift or crack in the oceanic crust. This opening allows magma from the mantle to rise, cool, and form new oceanic lithosphere. While the rising of molten rock and volcanic activity are parts of the process, they are consequences of the initial fracturing of the crust. Subduction is a separate process occurring at convergent boundaries.

Answer:

A crack forms in oceanic crust.