The cost of solar electricity is ________
A) comparable to the cost of electricity produced from fossil fuels
B) more than three times as expensive as electricity produced from fossil fuels
C) comparable to the cost of wind power
D) comparable to the cost of hydropower
B
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Debris flows that occur on volcanoes are called lahars. Indicate whether the statement is true or false
Which of the following is true regarding locations at high elevations?
A) Higher elevations experience higher temperatures during the day because they are closer to the Sun. B) Higher elevations experience lower average temperatures during both day and night. C) The density of air increases with increasing elevation. D) Temperatures at night, and in the shadows, are greater at higher elevations.
Which of the following occur during an uncontrolled fission chain reaction?
A) A heavy nucleus is broken into smaller nuclei B) More protons are produced than are consumed C) both a and b D) neither a nor b
The world land use pie graph shown here lets you know 
A. Approximately what proportion of the earth's biomes are used in each of the four ways B. How many hectares are devoted to each type of land use C. The relative amounts of land use for different parts of the world D. Precisely what percentage of land uses exist E. Approximately what proportion of earth's land surface is used in each of the four ways