________ use mirrors to concentrate the sun's rays on a series of pipes, which heats fluid inside the pipes to boiling, producing steam. The steam is then used to spin a turbine and generate electricity
A) Passive solar technologies
B) Solar photovoltaic farms
C) Biofuels
D) Concentrating solar power systems
E) Photovoltaic cells
D
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The equatorial regions of the African continent are dominated by which two climate categories?
A) BS/BW ? steppe and desert B) Af/Ca ? tropical rainy and humid subtropical C) Af/Aw ? tropical rainy and tropical savanna D) ET/EF ? tundra and ice cap E) Aw/Cs ? tropical savanna and Mediterranean
If we equate the entire Earth history to a single calendar year, then the human history only takes place in the last 30 seconds.
a. true b. false
An area of land in which there is little or no human development is referred to as a
A. tract development. B. multiple land use. C. reserve. D. wilderness.
A flood recurrence interval of 100 years means that floods of that size will occur only once every 100 years
Indicate whether the statement is true or false