[Q]: The southern province was exposed to intensive grazing for many years , and now soil quality is poor and dust storms are present. The northern province has more fertile soil, more trees. Which province experiences more nitrogen loss?
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[A]: southern

[Q]: John is comparing his medical record with his father's and son's medical records. John is 40 years old; his father is 70 years old; and his son is 10 years old. It appears that both John and his father has Retinitis. But his son does not have Retinitis. Whould Retinitis be a leading cause or minor cause of blindness for John?
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[A]: leading cause

[Q]: Park city used fossil fuels to produce their electricity. They were less conscious about the environment than their neighbors from Lake city. People from Lake city used nuclear fission as an energy source. Which city caused more acid rain?
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[A]: Park

[Q]: Bay city practiced organic farming and used almost no fertilizers. Gulf city practiced conventional farming for it inhabitants, and used vast quantities of fertilizers. Which city caused the entry of more hazardous chemicals into the ocean?
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[A]:
Gulf