Just off the coast of California, thousands of craterlike depressions, some as big as buses, dot the sea floor. Now, scientists say they know what's causing these mysterious features.
Researchers discovered the depressions while investigating a supersize version. In the late 1990s, scientists using ship-mounted sonar found enormous craters—more than 100 meters across and about 5 meters deep—on the bottom of the Pacific Ocean.
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