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\textbf{World Population Quiz}
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\item Asia is the continent with the highest population. Which continent has the second highest population?
\qu{Europe}{North and South America}{Africa}
\item How often is a new child born somewhere on this planet?%2
\qu{every second}{2.6 children are born per second}{every 9.8 seconds}
\item When did the world population reach six billion?%2
\qu{1989}{1999}{2005}
\item When did the world population reach one billion?%3
\qu{1690}{1725}{1804}
\item What percentage of the world's harvest is eaten by humans?%3
\qu{21\%}{33\%}{46\%}
\item A woman in the United States has on average\ldots%1
\qu{2.05 children}{2.34 children}{2.51 children}
\item Give an estimate for the world population in 2100:%3
\qu{about 8 billion}{about 9 billion}{more than 10 billion}
\item When do population experts expect the world population to reach a maximum?%1
\qu{in 2070}{the population will never stop to grow}{later than 2200}
\item How many humans have lived on our planet throughout history?%2
\qu{80 billion}{105 billion}{150 billion}
\item Name the five countries with the highest population:%China,India,US,Indonesia,Brazil
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{\tiny Sources: (1) URL: http://www.tagesschau.de (2) URL: http://en.wikipedia.org/wiki/List\_of\_countries\_by\_population}
\end{enumerate}
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