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is the study of underwater depth of lake or ocean floors.
An underwater mountain has height from the ocean bottom, the top and bottom of the mountain have depth from the surface of the water.
The Marianas Trench, and many other deep undersea valleys, can be found on the ocean floor.
mid-ocean ridge
neritic zone
A rapid change in temperature with depth in the ocean is called thermocline. A rapid change in density with depth in the ocean is called the pynocline.Thermocline
Sylvia Earle was born in 1935. She designed a small submarine for underwater exploration. She started a business called Deep Ocean Engineering which builds the small submarines, which can reach 35,000 feet, the deepest ocean depth known.
It's called a tsunami
It could be called a trench, crevice, ocean ridge, or abyss.
Thermocline
pycnocline
the pelagic zone