Sea level would be the name.
The height of the surface of the ocean is referred to as sea level.
The term "sea level" refers to the height of an ocean's surface.
Sea Level
Bih
Go do your homework.
The rising of the deep cold currents to the ocean surface is called
The satellite measures the height above the ocean surface by sending out a pulse and timing its return to the satellite. The difference between the two is the height of the ocean surface at a given location.
the ocean-bottom
Yes it is.
Height above earths surface is called elevation
Sonar
temperature