On the average, about what percentage of the solar energy that strikes the outer atmosphere
eventually reaches the earth's surface?
a. 5%
b. 15%
c. 30%
d. 50%
e. 70%
d
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Water use for irrigation in the region of the Aral Sea has resulted in
A. health problems from blowing toxic dust. B. decreased water salinity. C. increased crop yields because of nutrient salts deposited on fields. D. All of the choices are correct.
The Milky Way galaxy contains > 300 billion of stats, and the whole Universe contains > 100 billion of galaxies.
a. true b. false
The disadvantages of using oil shale and tar sands as energy sources include ____.
A. low net energy yield B. severe land disruption C. low potential supplies D. release of carbon dioxide and other air pollutants when produced and burned E. high water consumption
Assuming that the solvent is the same in all cases, which of the following has the largest particles?
A) a colloid B) a suspension C) a solution D) the pure solvent