The maximum slope angle that allows rock, sand, clay, and debris to stay in place without movement is termed as the angle of repose.
The angle of repose is the angle that the plane of contact between two bodies creates with the horizontal when the upper body is just on the point of sliding : the angle whose tangent is the coefficient of friction between the two bodies.
At angles, more vertical than the angle of repose, friction is not adequate to contradict gravity, and so mass wasting occurs. At angles, smaller than the angle of repose, gravity cannot overpower friction and so sediments may gather to create steeper slopes.
More about the angle of repose:
brainly.com/question/23683999
#SPJ4