Th correct answer is letter A. Echo sounding is very useful for depth profiles where SONAR is used to determine the depth of water through the transmission of sound pulses. It is calculated by checking the interval between the mission and the pulse that is recorded within the SONAR device.
Oil, turf, gas, and wood are popular.
I can’t see it. All I see is white
Spiral and or in one of the arms and that's pretty much all right now