Which of the following gives the correct order of the penetrating power of radiation?
A) a > b > g
B) b > a > g
C) b > g > a
D) g > b > a
D
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Removal of which of the following species will result in the greatest changes in an ecological system?
A) a carnivore species B) a keystone species C) a decomposer species D) a producer species E) a competitive species
What is the principal drawback to the use of tar sands as an energy source?
A. Large volumes of natural gas are required for processing. B. It is not located near the surface and thus amenable to strip mining. C. No large deposits are present in North America. D. Processing may produce carbon dioxide.
Characteristic of central Greenland:
From Table 29.1, the biome map, and the climate map, determine the terrestrial biome that best characterizes each of the following descriptions and write its name on the first line provided. On the second line, relate it to temperature and precipitation regimes and/or global pressure and wind belts outlined at the end of Section 1.
If the crustal abundance of some substance is 5% and a "good" ore deposit contains 25%, what is the concentration factor needed to economically mine this substance?
a. 0.20 b. 1 c. 2 d. 5 e. 25