The general term is seafloor. Along the edges of large land masses, the continental shelf is part of the seafloor.
it was... and it still is.
Sedimentary rocks formed under oceans, but the ocean may no longer be there. The Great Lakes region was once all under water and has much sedimentary rock.
it was big and ugly
continental
continental
Pangea
A rift zone on land, a mid ocean ridge under the ocean.
All of the mammals in the ocean once lived on land. Whales, dolphins, sea lions and seals.
land
More Earthquakes occur on land.
Techtonic plates move under the earth moving land and water.
Techtonic plates move under the earth moving land and water.
The continental crust is the land. The oceanic is under the ocean.