1. Nonpoint pollution and eutrophication are not well understood scientifically.
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2. The abundance of livestock causes manure production that exceeds the needs of crops to which the manure is applied.
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3. Outputs of N and P to agriculture in the US exceed inputs.
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4. Runoff from cities and acid rain
generated by human activities are two of the nonpoint sources of N to surface waters.
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5. Most eutrophic lakes would still require control of nonpoint inputs of P even if point source inputs of P were reduced to zero.
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6. Nonpoint source pollution is partly responsible for water shortages.
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7. Continued release of P from lake bottom sediments, even after P input is halted, can significantly delay lake recovery from eutrophication.
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8. People's preference for a meat-rich diet may lead in the future to less cropland and hence less N and P pollution.
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9. Chemical pollutants originate from point sources but not nonpoint sources.
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10. Regulatory standards for disposing of animal wastes are generally less stringent than those for treating human wastes.
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11. Eutrophication is a human-induced, not a natural, process of lake aging.
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12. Continued increases of nonpoint pollution are inevitable given projected population growth.
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13. Wetlands restoration may be the most cost-effective method of decreasing nonpoint N pollution.
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14. The atmosphere is a significant source of N in surface waters
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15. An area of cropland roughly 100 times the size of the livestock feedlot area is required to distribute manure nutrients at levels the plants on that land can use.
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16. Which of the following are characteristic traits of nonpoint pollution?
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17. Which of the following is not true?
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18. In urban areas, primary sources of N and P pollution in surface waters include which of the following?
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19. Improving water quality by reducing P input in the future is likely to require which of the following approaches?
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20. Adverse effects of eutrophication have been known to include all but which one of the following?
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