Pollution is best described as ________.
A. substances or materials that are toxic to humans, thus decreasing the quality of the human environment
B. the decrease in the quality of the environment as a result of natural events
C. changing the population growth of species
D. can be broken down by bacteria
E. adding substances or energy that harm the environment
Answer: E
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A) millibar. B) pascal. C) kilopascal. D) inches of mercury. E) all of the above
The subsurface area where the motion of seismic waves is initiated along the fault plane is called the
A) epicenter. B) fault area. C) Richter zone. D) focus, or hypocenter.
The 1980 eruption of Mt. St. Helens produced large lava flows that filled the nearby river valleys
Indicate whether the statement is true or false
Which of these is the most important cause of the increase in atmospheric CO2?
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