Which layer of the earth has the lowest density?
a. lithosphere
b. asthenosphere
c. continental crust
d. oceanic crust
d
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The fall of the Berlin Wall symbolizes the
A) end of the Cold War. B) beginning of the "new world order." C) triumph of capitalism over communism. D) end of the Cold War, the beginning of the "new world order," and the triumph of capitalism over communism.
According to most scientists, what is the greatest environmental problem facing the world today?
A)climate change B)the ozone hole C)water pollution D)overpopulation E)waste disposal
On a weather map, a red line with red semi-circles indicates a(n)
A) cold front. B) warm front. C) stationary front. D) occluded front. E) dissolving front.
In which of the following areas would one tend to find the highest net primary productivity?
A) Western Canada B) Central Australia C) Northern Brazil D) Eurasia