Some articles on sand, loose sand:
... the slope angle reaches the critical angle of repose (that is, the steepest angle the sand can maintain, where it is on the verge of collapse from slight ... Since the sides of the pit consist of loose sand at its angle of repose, they afford an insecure foothold to any small insects that inadvertently venture over the edge, such as ants ... treacherous walls of the pit, it is speedily checked in its efforts and brought down by showers of loose sand which are thrown at it from below by the larva ...
... U-shaped mounds of sand with convex noses trailed by elongated arms are parabolic dunes ... dunes where the erosion of vegetated sand leads to a U-shaped depression ... The bulk of the sand in the dune migrates forward ...
Famous quotes containing the words sand and/or loose:
“The shore is composed of a belt of smooth rounded white stones like paving-stones, excepting one or two short sand beaches, and is so steep that in many places a single leap will carry you into water over your head; and were it not for its remarkable transparency, that would be the last to be seen of its bottom till it rose on the opposite side. Some think it is bottomless.”
—Henry David Thoreau (18171862)
“What is left after this?
what can death loose in me
after your embrace?
your limbs are more terrible
to do me hurt.”
—Hilda Doolittle (18861961)