The steepest angle at which a sloping surface formed of a particular loose material is stable.
- The Kelso sand dune habitat is composed of a continuum of inclines, that vary from flat to steep (up to 32°, which is the angle of repose for fine sand).
- With little energy left at the top, we still had to descend, by the light of headlamps, 1,400 feet of a boulder field that had yet to settle on its angle of repose.
- In a silence dense as water your eye picks up no movement but the sloughing of sand, seeking its angle of repose.
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