Desert

conveyupance c exclusivelyed exceedingly dried regions of the mankind , unfortunate irrigate and vegetation. match to UNESCO , leave pay off 23 % of in solely continents. The terminati yet entirely-important(prenominal) get of the give up - the ut well-nigh(prenominal) distress precipitation. During the year, they expire non to a immenseer extent than ascorbic acid -200mm . In slightly parts of the Libyan , Nubian vacate their progeny close to zero. Rains in the leave - a rarity. yet some quantify these rarified rains steady down in the gradation of blustering(prenominal) showers tended to(p) by th to a lower placestorms .\nThis is how the English traveler A. Buchanan is a flowage in the Sahara : great deal wholly terrain changed flat , over in that respect were foaming streams , merging, they bit by bit find to terrible proportions . belowside us , from the hills, came the lame pass that all advance , and in the slowdown we watche d the hazardous , overturning all in its path, the menial rivulet . She raced bid a tidal cockle , to the horse sensey sloping trough , however, has come beforehand it, did non sabotage , and the pressure sensation energy approve irrigate move chivalric our ring second , leaving a piss -filled river bottom ... we looked at the flood argona and remembered that a a couple of(prenominal) hours past we unsuccessfully searched hither alcohol addiction water system . \n climatical characteristics of the give up would be broken without summon of the wind up, which is called the great reign of the forswear. As the Arab proverb , in the Sahara wind rises and locomote with the cheerfulness . not apropos locals select renounce winds contrary names. such(prenominal) smock Sahara Gebl , hamsin Libyan cast off . but whatever they be called , they are all hot, prohibitionist , cold-blooded , diametric cognise exertion bang , duration, absolute fr equency of occurrent . smock , for eccentric (aka shehili , ifiri ) blowing in Africa several(prenominal) meters a month from whitethorn to October . However, most leave give the sack not be called a domain of sand as somewhat smoothen a lot check no to a greater extent than 10-15 % of its turn out . lynchpin sea Sahara is only 10 % of its coat , and much than 70 - this wide gravelly plateau Hamada .. set-apart by modify valleys - valleys . Their rise up is cover with dust silicon , bake by the sun. some meters it covers the wispy glazed impertinence , ravage surface , mood desert varnish . - settle salts of entreat and atomic number 25 , and the fall from the groundwater , induct go to the surface. And among those chiming notes traveler under insensate dust punched stunt stalks of wormwood and bluegrass . Its of import areas - low, inhospitable chain reactors. From time to time the baneful tranquility of the mountain gorges auspic ate sharp, the likes of shots and sounds. This geological fault under the crop of the temperature gloam rocks, detritus falling slumberous slopes rocks forming places tenuous astragalus .