Which of the following cohorts is the most economically active and productive in the USA?
A) youth cohort
B) middle cohort
C) old-age cohort
D) All three cohorts are about equally economically productive.
Answer: B
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One limitation of wind power is that it ________
A) produces radioactive wastes B) involves mining C) produces water pollution D) is intermittent E) uses fossil fuels to generate electricity
An example of potential energy is
A. electricity flowing through a wire. B. the chemical energy in a candy bar. C. a bullet fired at high velocity. D. a leaf falling from a tree. E. water flowing.
The dry-summer subtropical climate is also called the ________ climate
A) savanna B) taiga C) monsoon D) Mediterranean E) nice
What region generates the most refugees, currently numbering about 6 million?
A) Africa B) Europe C) former Soviet Union (Russia + surrounding countries) D) Latin America E) Mediterranean