The main reasons are: -
Overgrazing by livestock. The natural vegetation is consumed faster than it can regrow.
Land clearing of natural vegetation. The balance of the ecosystem is severely disrupted and often leads to soil erosion and barren wasteland due to the lack of binding roots in the soil. This increases loose soil movement and seeds have little or no chance of germinating. Larger and more frequent dust storms also result.
Drainage of subterrainian aquifers such as Artesian Basins. Some of these aquifers used to be very close to the surface where some vegetation could utilise the water. Some also once provided natural springs, creeks and other water sources. Many are now either too low, or have dried up completely, or become too saline or polluted to use.
Salt encroachment of surface areas that turn into deserts due to a rise in underground salt water tables, and, overuse, damming and pollution of natural waterways and aquifers. The once mighty Colorado River and the Murray/Darling rivers are examples of desertification of waterways.
The biggest one in popular theory appears to be natural Climatic changes which are being sped up by man-made causes.
people dont use the soil or nutrients right
Desertification is occurring in a number of places around the world but the most pronounced is on the southern edge of the Sahara in Africa.
Africa
The answer is DESERTIFICATION
desertification
Desertification - the southward spread of the Sahara - is the major threat to the Sahel.
desertification
Over utilization of ground water, tree felling and over-grazing are some of the reasons for the spread of deserts.
Deserts formed by desertification are usually caused by human activities. Such activities as over grazing and poor agricultural processes can cause desertification.
Desertification occurs when trees and plants are removed from an area. Replanting may be necessary to help hold the soil.
The answer is DESERTIFICATION
It was a shame when the land became a desertification area. Desertification is when a piece of land becomes a desert.
Desertification
Desertification
Desertification is the process whereby productive land becomes desert.
The process is called desertification.
Desertification causes a decrease of vegetation.
Desertification is the degradation of land in drylands.
the formation is called desertification)
desertification