What measures have largely eliminated waterborne diseases in the United States?
A) stringent pig farm regulations
B) separation of sewage and drinking water
C) the Clean Water Act
D) water renovation and conservation
B
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The relationship between the size of an object on a map and its size on Earth's surface is
A) geography. B) spatial analysis. C) relief. D) scale.
The thermosphere closely corresponds to
A) the exosphere. B) the homosphere. C) the ionosphere. D) the heterosphere. E) both the ionosphere and the heterosphere.
For an opening of a given size, diffraction is more pronounced for
A. short wavelengths. B. long wavelengths. C. both of these D. none of the above
Where is Megalopolis located?
A) Midwestern United States, from St. Louis to Cincinnati B) East Coast of the United States, from Boston to Washington, D.C. C) The intermountain west of the United States, from Salt Lake City to Denver D) Texas, from Houston to San Antonio E) West Coast of United States, from Portland to Seattle