is the study of underwater depth of lake or ocean floors.
Areas of underwater ground are called seabeds 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.
A valley underwater is called a submarine canyon. These can form through a variety of geological processes, such as erosion by underwater currents or the collapse of underwater sediment. Submarine canyons can be important habitats for a diverse range of marine life.
The lines in the ocean on Google Maps are called bathymetric lines. These lines represent the depth of the ocean at different points. They help users understand the underwater topography and features of the ocean floor.
A rapid change in density with depth in the ocean is called a thermocline.
mid-ocean ridge
neritic zone
The average depth of the ocean is about 12,080 feet (3,682 meters). However, ocean depth can vary greatly across different regions. For example, the Pacific Ocean is the deepest, with an average depth of around 13,215 feet (4,028 meters), while the Atlantic Ocean is shallower, with an average depth of about 12,254 feet (3,735 meters). Other factors such as underwater mountain ranges and trenches can also affect ocean depth in specific areas.
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
It could be called a trench, crevice, ocean ridge, or abyss.
Thermocline