They were once part of the Kalahari Desert and covered in wind-blown sand-dunes, still present as gentle undulations and a sandy soil.
32.
The ponds start as trapped pockets of lake water and can erode away or be filled by wind-blown sand or drifting dunes.
33.
Second, wind blown sand separates the basin into 10 lakes with Lake Teli occupying a lower position than the lakes around it.
34.
Elsewhere the bedrock is covered by drift . At the northwestern periphery of the town the drift consists of recently blown sand.
35.
The lenses in the new Military Eye Protection System can be popped out or swapped for protection against wind-blown sand, sunlight or even laser beams.
36.
More importantly to geologists, Blake saw the erosive power of wind-blown sand in the pass and contributed to the significant scientific debates about mountain building.
37.
The formula was derived by Bagnold in 1936 and later published in his book " The Physics of Blown Sand and Desert Dunes " in 1941.
38.
In 1984 he produced a short film on the physics of blown sand and the life of the British scientist and explorer Brigadier Ralph Alger Bagnold.
39.
Robert Phillip Sharp was an expert on the physics of blown sand and the formation of sand dunes in the Mojave Desert and the Coachella Valley.
40.
It is a crook in the mountains that funnels the wind-blown sand to the base of the range, letting the grains collect in shifting white dunes.
