The subduction of cold, dense oceanic lithosphere into the mantle facilitates teh movement of plates by
slab pull. Indicate whether the statement is true or false.
T
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Intensive subsistence agriculture
A) is used primarily in parts of the world with small populations. B) involves more human labor than swidden agriculture. C) usually achieves only low productivity. D) is most commonly practiced in areas with little rainfall. E) relies on chickens and geese as draft animals.
It took more than 100 years for the world’s population to double from 1 billion to 2 billion. How long did it take for the world’s population to increase from 4 billion to 5 billion?
a) Fewer than 15 years as the result of exponential growth b) Half the time of the first doubling, about 50 years c) More than 100 years; 1 billion people are added each 100 years d) The world’s population has not yet reached 5 billion
Globalization is largely the result of
A) new forms of ground transportation. B) worldwide electronic communication. C) increased exploration into unpopulated regions of the world. D) major new discoveries of natural resources.
The dominant element in continental crust are
A) silica and aluminum. B) silica and magnesium. C) magnesium and aluminum. D) potassium and iron.