Answer: The major reason for this is desertification
Step-by-step explanation:
Three major reasons on how a fertile land can turn to a desert;
1) Climatic changes; One of the ways desert changes into dry land is as regards climatic changes. Due to the eaten up of too ozone layer by the sun, we begin to experience changes in the texture of the soul as the climate affects the strength of the soil thereby making the area dry gradually.
2) Human activities; another reason for this is human activities. Some persons want to experience or experiment so they build up systems to this. Another as regards this is the activities carried out on the soil by humans.
3) Overpopulation; this still related to human activities is one of the reasons we experience desertification.
How to prevent it
1) Human limiting exploitation of the soil
2) More attention should be paid to taking care of the fertile ground against climatic conditions.