Some erosion, such as that described in connection with river valleys, takes place slowly. The destructive soil erosion discussed in the largest part of this selection, however, goes on rapidly. One of the most important problems facing our country is the conservation of the soil lost by rapid erosion. Scientists have directed their attention to this problem and have found several effective solutions to it.

　　1. The passage mainly deals with causes of erosion.

　　2. Erosion is caused by natural forces such as a creeping glacier in mountain valley, the pounding ocean waves.

　　3. Wind is the most effective agent of erosion.

　　4. Vegetation increases the speed of running water on hillsides.

　　5. Young rivers are characterized by rapids and waterfalls.

　　6. Erosion can change rocks into fertile farm lands.

　　7. The movements of the earths crust is more destructive than erosion.

　　8. Erosion is a natural phenomenon to______the earths surface.

　　9. The cooler, denserair moves downward toward the earth because of______.

　　10. Even a short rain may result in ______ if the soil is loose and not protected by

　　vegetation.

　　答案：1. Y 2. Y 3. N 4. N 5. Y 6. N 7. NG 8. level 9. the force of gravity 10. small gullies

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