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суббота, 31 марта 2018 г.

HiPOD (31 March 2018): Dark Dunes on a Crater Floor    The dune…



HiPOD (31 March 2018): Dark Dunes on a Crater Floor 


   The dune type can be used as an indicator for the sand supply and shows the direction of the wind at the time when the dune was built. In some cases, dark layers in crater walls with down slope running dark streaks seem to be an additional supply for the dark material inside of a crater.


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