increasing trade with the Europeans
desire to make a religious pilgrimage to Mecca
improved transportation infrastructure
rise of a middle class that could afford leisure travel
2.What are the primary elements that make up the Earth’s atmosphere?
nitrogen, oxygen, and argon
oxygen and hydrogen
carbon, nitrogen, and helium
oxygen and helium
3. What economic system is characterized by an exchange of one product for another?
currency
barter
loan
free market
4. According to the theory of continental drift, what was the original state of the world’s continents?
They were gathered into two separate land masses, one at the north pole, the other at the south pole.
The continents were separate, as they are now.
The continents were joined into one landmass known as Pangaea.
Most of the continents were underwater and later rose as a result of shifting tectonic plates.
Which is considered one of the greatest threats to folk cultures around the world?
overpopulation
environmental activism
agriculture
popular culture
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