Compared with quartz, minerals that include the positively charged ions of aluminum, iron, magnesium, and calcium are ________ vulnerable to chemical weathering by acidic solutions.
A. more
B. not
C. less
D. just as
Answer: A
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Compressions and rarefactions normally travel in
A) the same direction in a wave. B) opposite directions in a wave.
What may be an ecological implication of global warming?
A) Since biodiversity is usually higher in warmer, milder climates, there will be little or no ecological implications. B) In general, plants and animals will probably benefit from warmer temperatures. C) Plants and animals may not be able to move to a suitable habitat quickly enough. D) Plants and animals will adjust quickly to the changes in temperature and begin to replicate and reproduce in new areas. E) Since farmland may be lost, the habitats of plants and animals will increase in area.
Which of the following is true of a hormone?
A) It is produced at the site of its action. B) It is produced at one location and then transported to its site of action. C) Either a or b is true, depending on the hormone. D) Neither a nor b is true.
Poverty, a low standard of living, the lack of opportunities and advantages, a poor educational system, or the lack of social services have all served to simply diminish the human spirit of the people living in West Africa and Nigeria.
a. true b. false