The main force driving thermohaline circulation is ____
A) wind
B) the Coriolis effect
C) density
D) electromagnetic attraction
C
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What makes light absorption in diatoms more effective than just using chlorophyll?
a. Surface-to-volume b. Microbial loop c. Frustule perforations d. Accessory pigments
Who allowed his ship to be trapped in the Arctic ice for nearly four years to prove that no Arctic continent existed?
a. Nansen b. Mahan c. Murray d. Anderson e. Thomson
Blood lead levels in children between 1996 and 2012 have
A) increased steadily despite EPA and CDC programs to eliminate lead from the environment. B) continued to decrease as exposure to lead has been reduced. C) remained about the same. D) increased in rural areas but declined in urban areas with heave vehicular traffic.
When a population pyramid has a broad base and a narrow top, what does that likely indicate?
A) an inadequate health care system B) a developing country C) a developed country D) outmigration E) urbanization