What commonly used pesticide caused declines in bird populations in the 1950s and 1960s by weakening the shells of bird eggs?
A) 2,4-D B) Roundup C) Malathion D) DDT
D
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Using this plot of annual peak discharge, what is the probability each year that a flood of 1,000 cubic meters per second will occur?
A) 1 in 1,000, or 0.01%
B) 1 in 100, or 1% (100-year flood)
C) Between 10% and 20%
D) More than 20%
Researchers in Switzerland have demonstrated that organic farming ________
A) presently has no market in Europe B) is only sustainable with pesticides and synthetic fertilizers C) suppresses the biodiversity of pollinating insects, especially bees D) increases the incidence of invasive species E) decreased organic soil losses while giving yields almost as high as conventional farming
Which of the following best describes how metamorphic rocks form?
A. Crystallization of magma B. Increased pressure and temperature C. Precipitation of minerals D. Lithification of sediment E. Weathering and erosion
In the United States today, the approach that best reduces the volume and weight of municipal solid waste is ________
A) sanitary landfills B) composting C) incineration D) in open pits E) municipal sewage treatment