The difference between point pollution and nonpoint pollution is that
A) point pollution has a clear source.
B) it is not possible to clean up point pollution.
C) nonpoint pollution is water pollution while point pollution is air pollution.
D) none of the above
A
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Every metamorphic rock has a ________ from which it formed.
Sanitary landfills typically have problems with
a. rodents and insects b. odor c. open, uncovered garbage d. traffic, noise, and dust e. spread of disease
What is the common pressure unit used in aviation and on television and radio?
A) inches of mercury B) millibar C) millimeters of mercury D) hectopascal
The United Nations' best estimate is that the global population will ________
A) level off at approximately 10 billion in the year 2100 B) begin to decline by the middle of the 21st century as humans deplete Earth's resources C) reach 13 billion by the year 2080 D) continue to increase indefinitely