China's Three Gorges Dam on the Yangtze and Vietnam's Nam Theun Dam on the Mekong demonstrate that
A) large hydroelectric projects can be carried out with little to no environmental impact and human displacement.
B) hydroelectric installations cannot produce enough energy to compete with fossil fuel plants.
C) the air pollution from the dams will have to be monitored constantly to protect human health.
D) the major impacts on downstream communities will have to be carefully studied.
C
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The troposphere:
A) is thinnest at the tropics. B) maintains a relatively constant temperature. C) is thicker in summer. D) often disappears near the poles in winter.
If San Francisco, California and Washington D.C. lie nearly on the same line of latitude, then why is San Francisco cool, foggy, and mild during the summer months and Washington D.C is hot and humid?
In glycerol 3-phosphate transport, found in muscle and nerve cells, how many ATP molecules are produced for each NADH + H+?
A) 1 B) 2 C) 3 D) 4
The point on Earth's orbit around the sun when the two bodies are farthest apart is called:
a. perihelion. b. aphelion. c. ecliptic. d. equinox.