1. What process breaks rocks into smaller pieces to become soil A. erosion C. pounding B. abrasion D. weathering 2. Which are the best agents of chemical weathering? A. wind and water C. oxygen and acid B. roots of plants D. water and plants 3. Which is made up of tiny bits of rocks with decaying plants and animals? A.rocks B. gravel C. soil D. humus 4. Which of the following activities of man contribute to the breaking down of rocks? A. fishin B. studying C. mining D. sky diving 5. How does temperature breakdown rocks A. Rocks break when it is cooled. B. Rocks break when it is heated. C. Rocks break when it is not exposed to water. D. Rocks break when it is heated and then cooled. 6. What are the causes of soil erosion? A. water, wind, man and animals B. water, reforestation, terracing C. landslides, floods, strip cropping D. building windbreak, man and animals 7. Which of the human activities cause soil erosion? A. digging, planting trees, construction, grazing B. illegal logging, quarrying, construction of buildings C. planting trees, strip cropping, terracing, reforestation D. illegal logging, strip cropping, quarrying, terracing 8. Which of the following is NOT an effect of erosion on landforms? A. formation of sand dunes B.mountains can change into plains C. man and animals could be killed D. irregularly-shaped slopes of the mountain 9. Landslide is an effect of soil erosion. Which of the following does NOT tell how dangerous landslides can be ? A. It can kill people. B. It can damage plants and animals. C. It can cause damage to properties D. Destroyed roads and bridges can be repaired. 10. Why is plant cover such as grass importante A. It holds soil in place. B. It grows easily. C You don't need to plant it. D. It makes the place green.​