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: -Divergent plate boundaries in the ocean create mid-ocean ridges. This is where new seafloor is created by upwelling magma. Divergent plate boundaries rift a continent apart. Eventually a new ocean will form between the two continents.

Detailed explanation-3: -The mass of the Earth is not increasing due to seafloor spreading. Seafloor spreading is the creation of new landmass on the seafloor that results from divergent plates, but tectonic activity at convergent plates destroys landmass at the same rate that it is created.

Detailed explanation-4: -This occurs through the movement and shifting of the tectonic plates under the ocean. A divergent boundary is a boundary between tectonic plates where the plates move away from one another – resulting in seafloor spreading in an oceanic setting. Some tectonic plates move quickly, and some move slowly.

Detailed explanation-5: -A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth’s mantle to the surface, solidifying to create new oceanic crust.