they crash land and scan the bottom
Sonar and Satellite Imaging.
Oceanic zone is mostly a region consisting of open ocean water with a wide range of undersea terrain.
Satellites use radar altimeters that are specially made tomeasurethe height of the ocean surface. The satellitesmeasurethe height of the ocean surface with an accuracy of 3cm realitve to the center of the earth.
Radiometric Dating.. APEX!
The ocean floor is very much like dry terrain; it has mountains and valleys, so the depth is not constant all over earth.
Due to gravity, ocean water is attracted to areas of high topography and away from areas of low topography on the sea floor, causing bulges and depressions on the ocean surface. Satellite radar can detect these changes in elevation.
The bottom of an ocean is typically called the seafloor. Although the seafloor can have variant geographical features such as mountains or volcanos, a normal, and flat terrain is called the seafloor.
The ocean floor is very much like dry terrain; it has mountains and valleys, so the depth is not constant all over earth.
From inside a satellite
Robotics is one such technology used today.
The topography of the ocean floor
which landforms are on the ocean floor