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From antiquity to world war i the depth of the ocean was measured by using a weighted rope with markings on it.
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Seafloor gravity maps aren t entirely new but until recently relied solely on data from older satellites.
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These were only sensitive enough to see the gravitational lumps caused by relatively.
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Once sonar became commercially available after world war i sound was used.
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High resolution maps of the seafloor bathymetric maps are important for ship navigation geological research habitat and ecosystem studies and military activities.