Word of the day: "barchan" - a crescent-shaped dune, steepest on its lee-slope slip-face (cf parabolic dunes, star-dunes & transverse dunes) http://pic.twitter.com/bIURQ9uUOi
— Robert Macfarlane (@RobGMacfarlane) June 12, 2017
via Twitter https://twitter.com/RobGMacfarlane
June 12, 2017 at 11:30AM
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