An Echo Sounder Operates by Measuring the Time Required for a ________

An echo sounder operates by measuring the time required for a ________.

A) light beam to travel from a satellite at a known altitude to the sea bottom and back
B) radar beam to travel from a harbor patrol boat to a fuzz-buster on a speeding yacht
C) radar beam to travel from a ship to the seafloor and back
D) sound pulse travels from a ship to the seafloor and back

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