[منينة منينة]

6-A serious threat to farmers in many parts of the world is erosion . If a large area of land is cleared of trees and bushes and is then badly treated by the farmer , the rain and winds may gradually wash away much of the fertile top soil
7-Big dams are built across rivers and their tributaries .In the rainy season , there is plenty of water , and the dams store it for use during the the dry months , at the same time , they provide the water dsed for generating electricity