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Detailed explanation-1: -The correct answer is Ocean Depth. ‘Fathometer’ is used to measure Ocean Depth. It is an instrument used for measuring the depth of water by the time required for a sound wave to travel from surface to bottom and for its echo to be returned.

Detailed explanation-2: -A fathometer is one such device that is used to determine ocean depths.

Detailed explanation-3: -Multibeam echosounders (MBEs), a type of sonar that sends out rapid sound waves in a fanlike formation to scan the bottom of the ocean floor, are used by the National Oceanic and Atmospheric Association (NOAA) to measure the depth of the ocean.

Detailed explanation-4: -depth finder, also called echo sounder, device used on ships to determine the depth of water by measuring the time it takes a sound (sonic pulse) produced just below the water surface to return, or echo, from the bottom of the body of water.

Detailed explanation-5: -Fathometer is used to measure Ocean depth. Fathometer is a depth finder that uses sound waves to determine the depth of water. The Richter Scale is used to measure the intensity of Earthquakes.