What is one of the best indicators of the momentum for continued population growth?
A) the youthfulness of a population
B) the death rate of a population
C) the average life expectancy of a population
D) the death rate and the average life expectancy
A
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The pattern of magnetic anomalies on the sea floor most resembles ______________
a) scales on a fish b) stripes on a zebra c) spots on a leopard d) splotches on a giraffe e) warts on a toad
Tropical savannas tend to be ________ than tropical dry forests
A) wetter B) drier C) wetter and colder D) drier and colder
In tropical regions, the "winter" season is merely the ________ period
A) zodiac B) low sun C) intertropical convergence D) easterly wave E) tropical cyclone
Which toxic gas is an important component in London-type smog?
A) ozone (O3 ) B) sulfur dioxide (SO2 ) C) radon (Rn) D) carbon monoxide (CO)