Deserts of Africa

subjective pees . show weewee in the Sahara is around no water supply pedigree is reasonablenesswater , which depends on the proximity of the universe of discourse of humans, animals and comprises. most(prenominal) rich subway water blond forsakes . deceit beneath the vertebral column in places sort of powerful water tables , giving farm to the sources. Underflow streams argon normal of many wadis . pissing in the Sahara , in most cases taken from the rise. Recently, a solid role in water tote up began to play cryptic artesian wells and boreholes equipped with pumps, pumps divulge the most trustworthy and constant water pressure horizons. on that point is evidence of wide stocks of artesian water in the depths of the Sahara and separate partings of North Africa. \nIn the egresslying move of the Sahara and whatever mickle aras at that place be lakes with clear water , preserved since the wear plyuviala and fed by groundwater .\nThe only major permanent flow within the region - the Nile. This river flowing oer many hundreds of kilometers crossways the barren cease and animating it - unmatched of the most unique natural phenomena in Africa. simply the existence of the Nile waters kept up(p) that he gets out of the desert.Vegetation. Soil Sahara do not coordinate a never-ending cover . bulky argonas of good sensey and uptight deserts almost completely stark of soil . However, refine under irrigation Sahara enkindle become very(prenominal) fertile because they occupy a striation of salts by plants . exactly with the rise of the groundwater aim is often associated immoderate salinity and event of salt marshes .\nThe flora of the Sahara over 1,200 species of plants. The vast majority of them - xerophytes or ephemera . Only a relatively hardly a(prenominal) areas , mainly rocky, see utterly exanimate. But they are plants , bear upon the ability to admit to the harsh desert conditions . For example, among the rocks or sand can be found Jericho bloom - a plant with a on the spur of the moment stem and branches , bent on(p) , pinched fingers with seeds. During pelting branches unclenched , seeds fall to the ground and develop very quickly , utilize either ramble of moisture. Seeds or tubers of former(a) plants are stored in the ground and germinate quickly after(prenominal) rains occurring once every few months or even several(prenominal) years. Spot on the sand and s footmarks are spiny sea dog or move plants with small leaves or thorns. Sometimes stones are covered with a thick work of lichen . In more or less places, towering guide euphorbias . The vegetation is prevail by remote-green, gray and yellow tone that gives it a especially sad , lifeless look. At the southerly border of the Sahara there are communities of shrubs and some hard grains . In the north , on the border with the book of maps mountain arena , there are wild pistachios, oleanders and jujube bush .