The ocean floor is literally the floor of the ocean.
What is a sea floor.
See the full definition for seafloor in the english language learners dictionary.
It is the bottom of the ocean when you dive.
The solid surface underlying a sea or an ocean.
The outer rocky layer of the earth includes about a dozen large sections called tectonic plates that are arranged like a spherical jig saw puzzle floating on top of the earth s hot flowing mantle.
The ground that is at the bottom of the sea.