In the twentieth century, half of the new dams that were built are in

A. Russia
B. China
C. The United States
D. Pakistan
E. Canada


Answer: B

Environmental & Atmospheric Sciences

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Marble is metamorphosed ________

A) gneiss B) shale C) limestone D) schist E) slate

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A) produces industrial smog. B) is affecting the stratospheric ozone concentration. C) forms smoke and fog. D) produces photochemical smog.

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