Answer:
The acronym SONAR stands for Sound Navigation And
Ranging. SONAR is a device which uses ultrasonic waves to measure the distance,
direction and speed ot under water objects,
Uses of SONAR technique are
(i) It is used to determine the depth of the sea.
(ii) It is used to locate under water hills, valleys, submarines,
ice-bergs, sunken ships, etc.
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