What percentage of the nation's demand for electricity could be produced in the future by wind energy?
70 to 75 percent
40 to 50 percent
5 to 10 percent
25 to 30 percent

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

you need more balloons

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