angle of repose

noun Geology.
the maximum slope, measured in degrees from the horizontal, at which loose solid material will remain in place without sliding.
Compare angle of slide.

1875–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
angle of repose
the maximum angle to the horizontal at which rocks, soil, etc, will remain without sliding

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The angle of repose increases as air pressure diminishes.
The inclination of a slope on which boulders would stay put was the angle of
Every pile of loose particles has a unique angle of repose, depending upon the
  material it's made from.
The natural angle of repose is defined as the angle at which material can be
  placed without sliding downhill due to gravity.
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