Most mountains are produced by
A. earthquakes.
B. volcanic activity.
C. tension.
D. compression.
Answer: D
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Which of the following has been a result of the U.S. Clean Water Act?
A. spurred creation of new technology B. less CO2 in the atmosphere C. smaller percentage of streams safe for fishing D. less need for sewage treatment plants
Distinguish between chemical and mechanical weathering
What will be an ideal response?
The variety of appearances and protective demonstrations associated with organisms on the coral reef
is a testament to the intense struggles in the ecosystem. Indicate whether the statement is true or false.
The most widespread negative health impact of air pollution is the
A) destruction of the cellular components of the immune system. B) loss of the ability to absorb vital nutrients by the digestive system. C) disruption of the signaling processes of the endocrine system. D) chronic stress that weakens many systems of the body.