Abyssal plains are extremely flat and featureless plains of the deep ocean floor.
In fact, the abyssal plains are likely the most level areas on the earth.
Abyssal plains covering a major portion of ocean floor between the depth of 3000m to 6000m.
They were once regarded as featureless plains but modem devices have shown that they are as irregular as the continental plain or surface.
They have extensive submarine plateaus, hills, guyots and seamounts.
The floor of the abyssal plain is covered by sediments.
The plains close to the continents are covered mostly by sediments brought down from the land.
But those seas which favour, an abundant growth of organisms have a thick layer of sediments, formed from the remains of living things.
These sediments are called oozes.
Some of the open seas do not support enough life to produce ooze on the floor.
They are covered with a type of sediment called red clay which is of volcanic origin or made up of tiny particles brought by wind and rivers.