The reduced size of the California condor population is thought to have been caused by
A. natural predation.
B. the extinction of large Ice Age mammals.
C. pesticides affecting egg formation.
D. the increased number of electric power lines.
Answer: B
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Which of the following occurs when ozone concentration decreases significantly?
A. more absorption of ultraviolet radiation at the Earth's surface B. more cases of skin cancer C. warming of the stratosphere D. more absorption of ultraviolet radiation in the stratosphere
Does radiational cooling at the ground at night act to increase or decrease atmospheric stability? How does daytime heating at the ground during the day affect atmospheric stability?
What will be an ideal response?
Water is the principal factor responsible for mass wasting
Indicate whether the statement is true or false
Most human activities tend to reduce flood hazards, so the frequency of floods of a given size has been decreasing for nearly all streams.
Answer the following statement true (T) or false (F)