Which of the following trace materials produces bright-red colors in some cherts?
A) Manganese
B) Clay particles
C) Iron oxide
D) Calcite
Answer: C
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If a population of species in an ecosystem does not fluctuate much over time, the ecosystem
A) has no significant buffering mechanisms. B) has many "eury" species. C) is said to be stable. D) has low inertia.
Making substitutions of mineral resources can be more efficient than recycling of mineral resources in alleviating the future mineral-resource shortage.
a. true b. false
6.4°C/1000 m (3.5°F/1000 ft.) refers to
A) a latitudinal lapse rate. B) changes in sensible heat with altitude. C) air pressure at sea level. D) an environmental lapse rate. E) the normal lapse rate.
Which of the following concerning the Ogallala is FALSE?
A) It is the largest water supply in Mexico. B) Most of it is literally being "mined." C) It is estimated that many irrigated acres will soon have to return to dryland farming. D) It contains as much water as one of the Great Lakes. E) The aquifer is most abundant under the Sandhills.