What Controls the Shape and Motion of Sand Dunes?
ES1603  Introduction
Fog appears over barchan dunes in the Namib Desert of southwestern Africa.

In some places on Earth, loose sand accumulates in sand dunes. The Sahara Desert of Africa is one location known for its sand dunes. Smaller accumulations of sand dunes are present on every continent. Not every location that has sand has sand dunes, though. What do you think controls whether sand dunes will form or not?

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