Given the following time frames for an energy source to be renewed, which one is nonrenewable?
A. coal: 10 million years
B. solar energy: 0 hours (except at night)
C. switchgrass: 3 months
D. trees: 50 years
Answer: A
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The greenhouse gas nitrous oxide, which you may know as laughing gas from your most recent visit to the dentist, has the chemical formula
A) NOx. B) N2O. C) NO2. D) NO
Which of the following statements is true about the Louisiana Purchase of 1803?
A. was negotiated with a grateful Spain after the U.S. confronted France. B. was the last major acquisition of territory west of the Mississippi. C. included territories that covered all of what would become the southern states. D. brought the mouth of the Mississippi under U.S. control.
If a specimen of granite were slowly heated, which mineral would melt first?
a. muscovite b. orthoclase c. plagioclase d. quartz
One ________ of natural gas is that it is ________ than either coal or oil.
A. Advantage; easier to find B. Advantage; easier to build infrastructure for transporting it C. Disadvantage; harder to sell D. Disadvantage; less abundant E. Disadvantage; harder to ship and store