GEOLOGY

Detailed explanation-1: -Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor. Eventually, the crust cracks.

Detailed explanation-2: -New crust is continually being pushed away from divergent boundaries (where sea-floor spreading occurs), increasing Earth’s surface. But the Earth isn’t getting any bigger.

Detailed explanation-3: -According to Seafloor Spreading Theory, there is a hot, less dense material from below the earth’s crust rises toward the surface at the mid-ocean ridge. This material flow sideways carrying the seafloor away from the ridge and creates a crack, it cools down and becomes the new seafloor.

Detailed explanation-4: -The molten material then spreads out, pushing older rock to both sides of the ridge. As the molten material cools, it forms a strip of solid rock (new ocean floor) in the center of the ridge.

Detailed explanation-5: -As the magma cools, it is pushed away from the flanks of the ridges. This spreading creates a successively younger ocean floor, and the flow of material is thought to bring about the migration, or drifting apart, of the continents.