Which human activity has directly contributed to global warming?
A) burning of coal
B) building of greenhouses
C) planting of trees
D) development of solar energy
Correct Answer:
Verified
Q12: Why is water so important in controlling
Q13: The planet Mercury is closer to the
Q14: Which item emits carbon dioxide into the
Q15: Which statement describes the greenhouse effect?
A) Most
Q16: Which item would probably contain the most
Q18: What situation would be most similar to
Q19: Which gas is considered a greenhouse gas?
A)
Q20: Why does sweating cool your body?
A) The
Q21: What human activities release the majority of
Q22: 
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