Sonar is a technology that uses sound waves to calculate the distance to an object. Explain why you think sonar is useful for scientists exploring the ocean floor. What can scientists do with sonar that may be difficult or impossible to do without it?

Sonar can be used to measure the depth of the seabed or the distance of any object, animal or a man-made vessel any other objects

Explanation:

This is much better way of measuring distances under the sea since light alone is not able to pierce through the ocean after a certain distance.

A powerful sonar blast can help in taking multiple measurements at a time, while even a laser will find it difficult to reach below 3 km of depth.