9. Which of the following human activities con lood to the destruction of the
environment
A. Deforestation
C. Quanying
B. Mountain-blasting
D. All of these
10. Why deforested mountains are easily eroded and more prone to landslides
A. There are plenty of animals playing in the mountain.
8. Strong winds can push and cany less soll particles
C. There are no trees which hold the soil and absorb the excess water in
D. During flood, it makes the soit unsaturated that it can't hold water
more than it nomeally can.
the soil.
11. Why is plant cover such as grass importante
A. It holds soil in place.
B. You don't need to plant it
C. It grows easily
D. It makes the place green.
12. Which of the following is a good effect of soil erosion
A. clogging of irrigation
C. deposition of mine tollings
B. decrease of food production
D. shaping of landforms
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