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When the productive potential of soil, especially on arid or semiarid land, falls by 10% or more because of prolonged drought and human activities, it is called
Q3: Choose the zone close to shore in
Q7: The advantages of modern synthetic pesticides include
Q19: Indoor hydroponic farming has a number of
Q26: During this century, with global climate change
Q32: About 88% of the increase in global
Q45: All of the following are alternatives to
Q49: Canada's 500-year-old Atlantic cod fishery collapsed and
Q77: Provides water for drinking.
Q77: In protecting species from premature extinction, and
Q90: Most fishing fleets today come from _