It is thought that the Earth's climate is being changed rapidly by ________
A) human-caused releases of impurities
B) increased oxygen content
C) natural sources of change
D) dust from volcanoes
E) decreases in carbon dioxide
Answer: A
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Which of the following best describes the trend in the United States wetlands during this century?
a) An increase in coastal wetlands and a decrease in freshwater wetlands b) A decrease in coastal wetlands and an increase in freshwater wetlands c) An increase in coastal wetlands and an increase in freshwater wetlands d) A decrease in coastal wetlands and a decrease in freshwater wetlands
Today's world cities are distinguished by being centers of all of the following except
A) international NGO and IGO headquarters. B) major corporate headquarters. C) world's most powerful media organizations. D) specialized and advanced business services. E) industrial production for global mass consumption.
Which of the following is a likely scenario for an organic farm?
a. use of synthetic pesticides b. use of synthetic fertilizers c. use of genetically engineered seeds d. use feed additives e. use of feed that contains no antibiotics
New ocean crust is generated at ________
A) ocean-ocean convergent boundaries B) ocean-continental convergent boundaries C) continental-continental convergent boundaries D) divergent plate boundaries