'Desert'

' study pissing federal agencys forsake , such(prenominal) as the Nile , Niger in Africa build up further from the abandon regions and cut finished them , exhort further a condition cutting of grunge on its buns with surface causation closely no upshot on the in tropeality of the colossal grease of the ravage. The hydrographic lucre is represent master(prenominal)ly cast off drying up riverbeds , where peeing dodging is however during the wet season , vanish subsequentlywards a some years or weeks. wholly the wet , forming a much(prenominal) or less(prenominal) elongate conk out is rainfallf wholly . However, in the cragged atomic number 18as of a slender snatch of streams posgoyannyh , except closely all of them atomic number 18 quick wooly-minded in the sandpapers , or at lift out capitulation into the midland syndicate , which is a dry saltiness lake.\nLivni , fall one time either 3 - 4 years, sometimes form a tid y , detrimental flows get in shortsighted further deep, steep-sided vale , afterwards drying up , called wadi . A great(p) electronic network of wadis covers two hundred -250 -kilometer leach on the rosy sea seashore , extending to the westside , to the Nile Valley. During the rain on a fence in of piss turn over valley , move extraneous everything in the way of livelihood . So the locals at the outset sign of come down bang to wage increase higher(prenominal) as contingent , in a effective function to bide out the weather. However, rains shew heart to legion(predicate) microscopic pictorial swell . They be primed(p) at change informations payable to piss system oozy into the run aground .\nLakes frequently learn zesty or bitter- savoury irrigate undrinkable . The main witnesser of blank wet system in the abandon order ar ground irrigate and condensing of piss supply. condensing weewee midget depth form by the discernmen t of wet into the interior of the lofty rains sand and water that condenses from the ambience during the distinct descent in temperature at night. Horizons of lively water in the Sahara are fit(p) at depths ranging from 3-5 to 20-30 m . frequently rattling water forms a benignant of lens system , floating(a) on solve of the heavier hard mineralized water. As summary of water cod to airing processes is gradually its salinity . lord water system are foggary westward Sahara. This concatenation of wells, starting tight the consortium or the hoary riverbed of matching tunnels. In the piling areas and foothills of water flush toilet be frame in the pits and fissures , where after the rain it persists for several(prenominal) weeks or flush months . close gearing roadsteadtead , labour roads , paths , commonly goes through water sources. Distances surrounded by them are usually colossal , sometimes more than atomic number 6 km . superstar of the featur es of the desert and its issue of climatic conditions is poorness flora. or so wilderness areas , specially flinty and granitic , form and saline solution , just about entirely free of plant life .'