There are major features of the ocean floor that can be identified by
undersea technology. The mid-oceanic ridge is a broad fractured
arch of the sea floor, where plates are moving apart. Sediment cover is
thin. The oceanic basin consists of abyssal hills and abyssal
plains, areas where abyssal hills are covered with sediment. Fracture
zones cut the mid-oceanic ridge and show strong evidence of
transform movement. The size, shape, composition, and structure of
seamounts indicate that they are similar to shield volcanoes.
The continental margins refers to the area near the meeting of
the oceans and land. There are submerging and emerging coast lines
dependant on the plate tectonic activity. Submergent coastlines are
when there is no activity, so erosion creates wide margins like on the
east coast of the United States. An emergent coastline is when
the land is rising compared to sea level. You find these steep margins
along the west coast of the United States.