Surface mining, when compared to subsurface mining, ____.
A. is more dangerous
B. is more expensive
C. produces less waste material
D. disturbs more land
E. causes subsidence
Answer: D
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In 1994 the United States, Canada and Mexico were linked through the
A) North American Free Trade Agreement. B) European Union. C) United Nations. D) North Atlantic Treaty Organization.
How much of the fish stocks are considered to be overfished?
a. 30% b. 50% c. 65% d. 80%
Height maps for the United States:
A) are updated twice a week. B) correspond to different approximate elevation levels. C) are done for 500 mb only. D) have little practical application in weather forecasting.
Which continent has more than 12,000 cubic kilometers of water available per year?
-Australia -North America -Asia -Europe -Africa -South America