Seafloor spreading where new floor is formed. Subduction zone where older floor is pushed back into the mantle.
sea-floor spreading
Plate tectonics.
Plate tectonics.
Seafloor Spreading created by harry hess
Seafloor Spreading created by harry hess
Seafloor Spreading created by harry hess
a normal fault
A normal fault would form.
A normal fault would form.
Rift valleys are where a continent is being pulled apart.
Well, Continental Rifting is the process in which a continent is literally pulled apart. First, sediment collects on the floor of the rift valley. Oceanic crust made of gabbro and basalt is formed, which is dense and causes the valley to sink. Eventually, ocean water flows into the valley. There you have it. Hope this Helped.
It causes what we call "sea-floor spreading." Sea-floor spreading is the process in which the ocean floor is extended when two plates move apart. As the plates move apart, the rocks break and form a crack between the plates. Earthquakes occur along the plate boundary. Magma rises through the cracks and seeps out onto the ocean floor like a long, thin, undersea volcano.