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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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
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