Word: sonar
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Dates: during 1970-1979
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...giant basketball. Strangely enough, the water temperatures near these ridges are considerably higher than those elsewhere in the ocean. In addition, there are ocean-floor fault lines or cracks that were apparently caused by movement of the seabed itself. Although the oceans are billions of years old, sonar measurement of the depth of accumulated sediment indicated that the sea floor is no more than a few hundred million years old; the deposit of sediment should be much thicker...