About what percent of thunderstorms in the United States become severe?
A) 10% B) 50% C) 20% D) 25%
A
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In the United States, acid rain is most common in the
A) Pacific Northwest. B) Southeast. C) South. D) Northeast. E) Rocky Mountain West.
The effect of ozone destruction is most severe ________.
A. at polar latitudes B. at equatorial latitudes C. at temperate latitudes D. in terrestrial desert areas E. All of these are equally affected.
When the EPA began risk assessment in the mid-1970s, it was primarily concerned with
A) the safety of public transportation systems.
B) interactions between people and wildlife in national parks.
C) cancer risks associated with pesticides and toxic chemicals.
D) accidents associated with lost time on the job and workers' compensation.
Which process would most be responsible for the greatest incremental growth in a water droplet?
A. strong surface tension B. evaporation C. collision-coalescence D. condensation nuclei