The Dust Bowl
A) was caused by dust devils.
B) could not happen again because agricultural practices have changed.
C) occurred during the 1940s.
D) took place on the Great Plains.
E) all of the above
D
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After the winter solstice at middle latitudes in the Northern Hemisphere, the length of the day ____
A) increases B) decreases C) does not change D) is 12 hours long
The Great Plains of the United States and Canada are dominated by:
A) Coniferous forest B) Desert shrub C) Middle-latitude prairie and steppe grassland D) Tropical forest
In general, environmentalists believe that governments should ________
A) deregulate corporations B) lower corporate taxes C) nationalize all Earth's natural resources D) discourage ecolabeling E) promote social and environmental justice
In which of the following conditions is the use of helicopters at airports effective to mix the air and disperse radiation fog?
A. The fog layer is deep. B. The liquid water content of the fog is high. C. The liquid water content of the fog is low. D. The fog layer is not deep.