The doubling time of some of the world periphery's largest, fastest growing cities is
A) 6-12 months.
B) 10-20 years.
C) 50-70 years.
D) 100-150 years.
Answer: B
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Which of the following rocks is most likely to be formed from compacted plant remains?
a. coal b. limestone c. rock salt d. marble e. granite
Current ripple marks differ from wave ripple marks because ____
a. current ripple marks flow in two directions b. wave ripple marks flow in one direction c. current ripple marks are common along the shoreline d. current ripple marks are asymmetrical e. wave ripple marks are asymmetrical
Salmon introduction in the Great Lakes has brought in millions of dollars from sportfishing, yet environmentally it has
A. decreased migratory bird populations. B. improved water quality. C. increased exotic invasive fish populations. D. decreased native fish populations and disrupted spawning.
Most rain at middle latitudes is produced by the ice crystal process. This is because ____
A) clouds in these region have below-freezing temperatures at all levels but experience strong uplifts B) clouds in these regions can extend into regions where air temperatures are below freezing C) ice crystals evaporate more slowly than water droplets in clouds of these regions D) most rain occurs during the winter in these regions