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When the 10-meter-high tsunami wave that followed the March 2011 magnitude 9.0 earthquake in Japan receded, it took with it some 23 million metric tons of material, including pieces of buildings, wood, plastics and more. Whereas most of the wreckage sank to the ocean floor, some of it is still floating toward other Pacific nations . The "debris field"--the visible wave of material--has dissipated, leaving the junk invisible to satellites.
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