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What is the angle of repose for dry sand?
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sand dune
Sand dunes in the Sahara, Morocco.
The angle of repose for dry sand is approximately 32°.1
In the context of sand dune formation, this angle represents the maximum slope at which loose sand can remain stable on the leeward side of a dune, known as the slip face. When sand accumulates on this slope and reaches this angle, the material begins to slip down, maintaining the dune's equilibrium as it migrates.1