What does the sea bed look like?

The bat is that area of the Earth which has been researched the least. However, we know, through sound wave technology, that there are deep valleys, high mountain ranges, steep slopes, and flat regions on the seabed. We also know that the seabed undergoes continuous changes. Underwater volcanic mountain ⛰ridges from at place where to tectonic plates move away from each other, and these ridges grow every year by a few centimeters. Generally, the bed of the flat seas,such a as the coral reefs is densely populated with plants and animals. In contrast, the deeper regions in the seabed are often covered by a layer of sand, dust,and dead organisms from the rivers, which is several hundred meters thick.