The role of trees is to______.
A: loose soil
B: keep soil in position
C: harden soil
D: Both A and B
A: loose soil
B: keep soil in position
C: harden soil
D: Both A and B
举一反三
- At the moment of applying load on saturated cohesive soil, who bears all the stress increase in the soil? A: Soil skeleton B: Pore water C: Both soil skeleton and pore water D: None of the above is true.
- Soil erosion was （ ） by the planting of trees in these areas.
- Soil fertility is soil productivity, which refers to the ability of soil to produce plant products.
- Soil radiation is the only source of soil heat.
- Soil erosion was ____ by the planting of trees in these areas. A: mitigated B: mistaken C: involved D: confirmed