Question

explain about the physiographic features of ocean​

Answer 1

Answer:

The ocean basins are the result of tectonic forces and processes. All of the ocean basins were formed from volcanic rock that was released from fissures located at the mid-oceanic ridges. The oldest rocks found in these basins are approximately 200 million years old. This is a lot younger than the oldest continental rocks which have ages greater than 4 billion years. The reason for this discrepancy is simple. Tectonic processes destroy old oceanic rocks! Oceanic rock is returned to the Earth's mantle when oceanic crust is subducted. Many of these subduction zones occur at the continental margins where oceanic crust meets continental crust. Subduction also creates the ocean's deep trenches.