desert pavement


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desert pavement

[¦dez·ərt ′pāv·mənt]
(geology)
A mosaic of pebbles and large stones which accumulate as the finer dust and sand particles are blown away by the wind. Also known as desert crust.
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During the study, which is the first of its kind in the Middle East, members from Nasa (National Aeronautics and Space Administration) and the Arab Youth Venture Foundation (AYVF) will research the surface transitions and microbial life from the sandy dunes and desert pavement (gravel surfaces) in areas of Al Ain and Al Gharbia (the Western Region).
The team of scientists will research the surface transitions and microbial life from the sandy dunes and desert pavement (gravel surfaces) in areas of Al Ain and Al Gharbia in the Western Region.
While in UAE, the research team plans to study the surface transitions and microbial life from the sandy dunes and desert pavement (gravel surfaces) in areas of Al Ain and Al Gharbia.
Embedded in the sun-darkened crust called desert pavement, the lines are practically invisible until Ramirez begins to describe them.
A colour contrast can now be seen in aerial views, with the darker zones being the in-filled stone lines and undisturbed desert pavement, while the cleared areas show up as lighter areas.
The sample of the undisturbed desert surface (60-80mm depth) gave an age of about 12 000 years, which strongly suggests the source of the grains was mainly in situ breakdown of partially exposed rock fragments or downward movement of grains into the desert pavement that had been exposed to light by much earlier events.
Despite the connotations of its name, desert pavement isn't robust.
Damage can happen in a moment, out me processes that sculpt desert pavement typically act slowly, taking centuries to generate a surface resistant to wind erosion.
A comparison of satellite images taken just before and after the conflict show that almost 950 square kilometers of desert pavement were destroyed by such activity, says Farouk El-Baz, a geologist at Boston University.
With today's drier climate in Kuwait and southern Iraq, it would probably take millennia for the wind alone to resculpt a fully mature desert pavement over the regions damaged by this year's conflict in Iraq, says El-Baz.
Fish Lake is on what we call desert pavement,'' Fred said.
They were created between 400 BC and AD 650 by the removal of reddish oxidised stones from the desert pavement to reveal the lighter sand beneath.