Middle-range forecasting has a serious loss of accuracy after about
A) three days.
B) seven days.
C) 14 days.
D) 20 days.
Answer: B
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Which of the following is a point source of water pollution?
A. offshore oil well B. livestock feedlot C. urban land D. cropland E. logged forest
Water's salinity can be increased by
A) entering freshwater streams. B) decreased rates of evaporation. C) ice freezing. D) ice melting.
This wind-blown dust deposit (loess) from Tibet
A) was deposited by a huge flood of seawater that covered the land at the time of the dinosaurs.
B) began as clay and silt that were produced by grinding of rocks along ice-age glaciers.
C) forms a worldwide layer associated with a well-known extinction of dinosaurs.
D) All of these are correct.
Because of chaos theory, the longest theoretical time span for accurate forecasts is believed to be about
A) 2 weeks. B) 4 weeks. C) 2 months. D) 3 months. E) 4 months.