Primary air pollutants ____, whereas secondary pollutants _____
A) enter the atmosphere directly; form by chemical actions involving other pollutants
B) form through a series of chemical reactions; occur naturally
C) occur naturally; are synthetic
D) enter the atmosphere directly; enter the atmosphere through human intervention
A
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The East/West divide that first emerged with the Russian Revolution of 1917 and is still seen in US/China relations, is centered on the West's anxieties about
A) colonialism. B) neocolonialism. C) human rights. D) communism. E) nationalism.
Mountain-building activity in the present-day Rocky Mountains occurred during this phase of the
Cordilleran orogeny:a. Sonoma d. Sevier b. Laramide e. none of the above c. Nevadan
What were the differences between early Spanish colonias, pueblos, villas, and ranchos in the Southwest?
What will be an ideal response?
The basic soil sampling unit is
A) soil horizon. B) soil profile. C) polypedon. D) pedon.