the ocean-bottom
The rising of the deep cold currents to the ocean surface is called
you are under the ocean
Europa, a moon of Jupiter, has a frozen surface with the possibility of a liquid ocean under the surface.
gas
temperature
Dolphins live beneath the sea in the water. There is nothing called 'weather' under the ocean's surface.
This section of the ocean from floor to surface is called the water column.
The water that forms far below the surface is called a Deep Current.
Stream like movements of water that occur near the surface of the ocean are called surface currents. Stream like movements of ocean water far below the surface are known as a deep current.
surface current
Sure. The mountains are often tall enough to poke through the surface of the ocean where they are called islands. There are deep valleys under the ocean, too. Some are deep enough that you could put Mount Everest in the ocean into these valleys, and it would be completely covered in water.
Oceanic plate