Carbon dioxide warms the troposphere, enhancing the planet's natural
A. greenhouse effect
B. tipping point
C. biogeochemical cycle
D. carbon cycle
E. net primary production
Answer: A
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The world region that experienced the greatest increase of internally displaced persons (IDPs) in 2012—to almost six million—is
A) North America. B) Latin America. C) Africa. D) the Middle East. E) Asia.
Oxygen atoms are used to make water molecules. Does this mean that oxygen, O2, and water, H2O, have similar properties?
A) Yes, and this explains how fish are able to breathe water. B) Yes, but that their properties are similar is only a coincidence. C) No, but their similar properties are only a coincidence. D) No, compounds are uniquely different from the elements from which they're made.
The point of origin of an earthquake at depth is called _____.
a.) a foreshock b.) the epicenter c.) the focus d.) an aftershock e.) the fixed point
Sixty percent of the world's forests are old-growth forests.
Answer the following statement true (T) or false (F)