Which of the following is mainly responsible for red sunsets, blue moons, and milky white skies?
A. reflection of light
B. dispersion of light
C. refraction of light
D. scattering of light
Answer: D
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The sediments that make up the Ganges river delta in India are often toxic because they
A. Are highly acidic due to acid rain B. Run through toxic soils C. Dissolve naturally-occurring sulfur dioxide D. Originate in coastal industrial areas E. Have concentrations of naturally occurring arsenic
Recent U.S. legislation has mandated increased use of biofuels, and the number of ethanol refineries is growing rapidly. It is now predicted that by 2015, as much as ________% of the U.S. corn crop could go toward ethanol production.
A. 50% B. 70% C. 25% D. 100%
Because ________ costs were much higher in Singapore than in neighboring countries, the city-state promoted higher-technology and capital-intensive industries domestically, and enticed power-technology industries to relocate either long distance—to
Thailand, Vietnam, or southern China—or to neighboring Malaysia and Indonesia. A) food B) machinery C) land and labor D) medical
How are tree rings used as proxy data to provide an indirect record of past climate conditions?
a. ?Tree rings are thicker and the wood is denser when growing conditions are better. b. ?Tree rings are thicker and the wood is lighter when growing conditions are better. c. ?Tree rings are thinner and the wood is denser when growing conditions are better. d. ?Tree rings are thinner and the wood is lighter when growing conditions are better. e. ?Because of variable moisture levels, tree rings cannot be used as proxy data.