土壤侵蚀类型 soil erosion type
A、Volcano eruption
B、Typhoon
C、Earthquake
D、Soil erosion
A.over-farming and soil erosion
B.soil moisture
C.water conservation
D.natural disasters
A、Desertification
B、Optical radiation
C、Volcano eruption
D、Soil erosion
Research completed in 1982 found that in the United States soil erosion ______.
A.reduced the productivity of farmland by 20 percent
B.was almost as severe as in India and China
C.was causing significant damage to 20 percent of farmland
D.could be reduced by converting cultivated land to meadow or forest
What can contribute to drought?
A.over-farming and soil erosion
B.soil moisture
C.water conservation
D.natural disasters
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