The graph below indicates that global temperatures have 
A) varied randomly over the last 160 years.
B) shown no real trend over the last 160 years.
C) tended to increase,especially in the last 100 years.
D) tended to decrease over the last 160 years.
Correct Answer:
Verified
Q3: One of the major effects of an
Q29: In comparison to past estimates, extinction rates
Q31: Why are there many deserts at 30°
Q32: Global warming
A)occurs mainly at the equator.
B)occurs mainly
Q33: Increasing carbon sinks will
A)increase global warming and
Q34: What causes the movement of warm air
Q36: Atmospheric carbon dioxide levels are shown below.This
Q37: Not all gases are greenhouse gases.Which of
Q39: Which of the following choices is a
Q39: Which term encompasses all the others?
A) climate
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