Which front is shown on weather maps as a line with alternating semicircles and triangles on the same side of the line?
A) Warm front
B) Cold front
C) Stationary front
D) Occluded front
E) Dry front
Answer: D
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Why do 2500 economists, including eight Nobel Prize Winners in economics, believe that the U.S. tax system is backwards?
A. because it encourages more pollution B. because it encourages more jobs C. because it discourages resource waste D. because it discourages environmental degradation
A half-life is the amount of time required ____
a. to lose half the daughter isotopes b. for the mass of the sample to decrease by one-half c. for half of the parent atoms to decay to daughter atoms d. for the parent atoms to increase by one-half e. to accurately date a rock sample
What property of plastic enables it to accumulate in ocean gyres?
A) It releases toxins as it decays. B) It absorbs carbon dioxide before photosynthetic organisms can get any. C) It blocks sunlight from penetrating into the ocean. D) It isn't biodegradable.
The presence of which of the following cations results in hard water?
A) Ca2+ B) Fe3+ C) Mg2+ D) any of these