The U.S. Department of Energy estimates that wind farms in North Dakota, Kansas, and Texas could meet the electricity needs of ____.
A. 50% of their populations
B. the populations of their states
C. the population of the western United States
D. the population of the entire United States
E. the population of the lower 48 states
Answer: E
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Which of the following is a type of speleothem?
a. column b. haystack hill c. geyser d. tower karst e. swallow hole
Which of the following causes magma to be less viscous?
A. a lower temperature B. a more felsic composition C. a higher percentage of crystals D. fewer silicate chains in the magma E. None of these choices are correct.
An anoxic atmosphere was needed for life to first form on Earth
a. True b. False
According to Milankovitch theory: a. the theory of plate tectonics explains most of the recent global warming
b. variations in the earth's orbit characteristics change the amount of solar radiation received at the earth's surface. c. negative feedback mechanisms exactly counteract positive feedback mechanisms. d. All of these choices.