The air masses that have the greatest influence on weather conditions in the central United States are ________
A) cT and cP B) cP and mT C) mP and cP D) mP and mT
B
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Primary pollutants are
A. chemicals or substances emitted directly into the air. B. those formed from reactions with other pollutants in the atmosphere. C. found only in stratospheric ozone. D. also known as natural pollutants. E. found only in fossil fuels.
Which marine ecosystem has the highest average net primary productivity?
A) Algae beds and coral reefs B) Estuaries C) Freshwater swamp and marsh D) Open Ocean E) Upwelling zone
Population change is calculated using which formula?
A. (deaths + emigration) ? (births + immigration) B. (births + immigration) ? (deaths + emigration) C. (deaths + immigration) ? (births + emigration) D. (births + emigration) ? (deaths + immigration) E. (births + deaths) ? (immigration + emigration)
Large-scale segregation was established in the Republic of South Africa through the creation of:
A) reservations B) ghettos C) homelands D) ethnoburbs E) none of the above