Desertification is the expansion of desert into the surrounding areas. The desert area in the world is getting bigger. Desertification usually happens on the edge of deserts. It is caused by a variety of factors.
There are many causes of desert spreading:
- Climatic change (natural factor)
The distribution of rainfall in the surrounding area of desert is uneven. From 1970 onwards, the world's weather has been changing. There has been less rain, and the world is becoming more dry. Drought affects the area surrounding. As a result, many crops and animals have died. There is no vegetation to protect the soil. The topsoil is removed by sudden flash floods or strong wind. This makes the soil erode and the desert spread towards the surrounding area.
- Rapid population growth (human factor)