For how long were dinosaurs the dominant species on the Earth?
A) 5 million years
B) 37 million years
C) 160 million years
D) 546 million years
Answer: C
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Temperature inversions increase outdoor air pollution because they
A. accelerate photochemical reactions. B. are taller than most smokestacks. C. prevent brown air smog. D. prevent the natural mixing of air. E. accelerate the emission of primary pollutants.
Which of the following components constitute(s) the greatest portion of the soil?
A) humus B) air C) rocks and rock particles D) dissolved substances
The ____________ visited North America 500 years prior to the arrival of Columbus. What will be an ideal response?
Of the following cloud types, which is most likely to produce the most rain?
A) altocumulus B) cumulus C) nimbostratus D) stratocumulus E) stratus