How is depth of sea measured?

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Sonar can be used. Sound waves move at a specific speed underwater. Scientists calculate the distance it takes for the sound to reach the bottom of sea and travel back to the surface. It's basically echolocation.

you have to use the sonar to track animals and measure the ocean

In volume you silly billy

by using echo-sounders or ships                        ANDby using data from satellite altimeters

its measured in  fathoms

It is measured in fathometers. Hope this helped! :)