Which is an advantage of using hydrogen as an energy source?
A. Hydrogen is locked up in water and organic compounds.
B. Hydrogen fuel cells are inexpensive.
C. Hydrogen always produces fewer carbon dioxide emissions than coal or natural gas.
D. Hydrogen requires no storage systems.
E. Hydrogen produces no carbon dioxide emissions if produced with renewables.
Answer: E
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Which of the following is true about quartz?
A) It fractures in unpredictable patterns. B) It forms eight-sided crystals. C) It has two directions of cleavage. D) It has three directions of cleavage.
GPS units are
A) accurately allow determination of longitude and latitude. B) a metric version of longitude and latitude. C) th of a Greenwich Precision Second. D) not available to the public; they are only available to the military.
Which cloud type is composed of ice crystals and can cause a halo to form around the Sun or Moon?
a. altostratus b. stratus c. nimbostratus d. cirrostratus e. angelitus
Which of the following are settings where surface water becomes groundwater?
A. a river that is higher than the water table B. where an impermeable unit lies at the surface C. a spring D. All of these choices are correct. E. None of these choices are correct.