The feature that forms most of the ocean floor is the abyssal plain.
Explanation;
An abyssal plain is an underwater plain covered by sediments on the deep ocean floor. They lie between the foot of a continental and a mid-ocean ridge and cover more than 50% of the Earth's surface.
Abyssal plain are formed as a result of the seafloor and the melting of the lower ocean crust. They are the flattest, most featureless areas on the Earth.
Abyssal plains cover more area in the Atlantic and Indian Oceans and less of the Pacific Ocean.
