A Structure.
the ocean-bottom
under toe
Trenches
They are called trenches.
Crust under the oceans is called oceanic crust.
continental
When you are talking about jelly under the ocean, you usually mean jellyfish. And jellyfish, like any other living organism, do have structures. They don't have skeletons, but they do have organized tissue.
Continental shelf
it is called voyage under position ocean
The land under an ocean at the edge of a continent is called the continental shelf. This is the shallow submerged portion of a continent that extends from the shoreline to the continental slope.
The crust not under the ocean is called continental crust. It is thicker and less dense compared to oceanic crust and forms the landmasses on Earth's surface.
it creates a tsunami