In what kind of nighttime cooling are ground-level temperatures colder than temperatures above the ground?
radiation inversion
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Human migration has had little effect on the distribution of the world's population
Indicate whether the statement is true or false.
Couplings are tightened and loosened with a _____ wrench.
a. hose b. hydrant c. spanner d. lug
Clear-cutting ________
A) restricts timber harvesting to mountaintops B) removes all trees from an area C) is a form of violent protest favored by radical environmental organizations D) is harvesting trees from coastal areas only E) involves elimination of subsidies to farmers
Which of the following sites in South America would be best for generating electricity from solar energy, if clouds were NOT a factor?
A. a site near the equator, such as the Galápagos B. a site at high latitudes (very far south in this case) C. Ushuaia, near the southern tip of the continent