Mafic rocks contain about ________% silica.
A. 50
B. 10
C. 80
D. 25
E. 65
Answer: A
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Which of the following problems does international globalization tend to exacerbate?
A) climate change B) air and water pollution C) deforestation D) climate change, air pollution and water pollution E) air and water pollution, climate change, and deforestation
The salinity of seawater is determined by measuring the amount of chloride ion. Why?
a) Chloride ion is part of the salt crystal. b) Chloride must ionic bond to sodium. c) Chloride is in every salt molecule in seawater. d) Chloride ion is the most abundant ion in seawater and gives a more accurate result.
Examples of renewable resources include all of the following except
A. wind. B. natural gas. C. solar. D. hydro.
"Scale" relates ________ to ________
A) Earth distance, Earth distance B) map distance, map distance C) map distance, Earth distance D) Earth distance, map distortion E) map distortion, map distance