According to the graph below, 
The net import of petroleum drastically decreased during the years
A) 1970 to 1977.
B) 1973 to 1975.
C) 1977 to 1982.
D) 1985 to 1990.
Correct Answer:
Verified
Q26: Which common process on earth is endothermic?
A)the
Q27: Which is not a known advantage of
Q28: Which is an advantage of using coal
Q29: According to the graph below, 
Q30: Petroleum (crude oil)is a complex mixture of
Q32: Which factor did not play a major
Q33: In the petroleum industry,what does a refinery
Q34: Soft lignite (brown coal)is the lowest grade
Q35: Which is a fossil fuel?
A)wood
B)uranium
C)ethanol
D)natural gas
Q36: The process by which a solution is
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