Explain Any three causes of soil …

4. Deforestation When vegetation cover is destroyed, the land gets exposed to the agents of soil erosion. Trees act as barriers against many causes of soil erosion including raindrops and moving wind. Roots also serve in binding the soil together hence cannot be easily disintegrated and made available for the agents of erosion. 5. Wind Depending on the strength and type of the wind, the upper layer of the unprotected soil can be effortlessly carried away. Whirlwind, for example, with its vigorous rotation, can not only take the soil away but also leave the surface uncovered. On a bare land, the magnitude of the wind erosion is felt significantly. Lighter winds do however have a negligible effect on the erosion. 6. Land tillage Land cultivation also exposes soil. Continuous digging destroys the soil structure after some time due to repeated breakdown of the top soil layer. Soil particles tend to be disintegrated to finer particles thus remaining susceptible to the agents of erosion over time. Some forms of cultivation in sloppy areas may also aggravate the impact of soil erosion. 7. Overgrazing Keeping a large stock of livestock in a smaller area will eventually lead to a depletion of the vegetative cover on the land leaving it bare. The continuous pressure on the soil by the animals will destroy the topsoil structure. With this, the soil will simply respond to the natural causes of soil erosion like wind and rainfall. Sheet erosion will consequently occur after some time.

Floding ,over raining ,shifting cultivation and deforestation

1. By rivers