Science | Katie Mettler, The Washington Post | Tuesday August 27, 2019
Michael and Larissa Hoult were sailing from the Vava'u islands of Tonga to Fiji in the South Pacific Ocean when they saw it - a "total rock rubble slick" extending for miles around them. The rocks, some the size of marbles and others as big as basketballs, bumped against their boat and clogged their rudders.
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