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How is the depth of the sea measured?
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The chief method is echo-sounding. The sounder directs an ultrasonic signal at the sea bed and measures the time it takes for an echo to return. From this measurement, and a knowledge of the speed of sound in water, the depth can be calculated.
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Previous:
Back
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Book:
1001
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Section:
Science and Technology
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Chapter:
Undersea Exploration
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