In 1900,the most commonly used source of energy in the United States was ________;today it is ________. 
A) coal;oil
B) oil;natural gas
C) coal;natural gas
D) nuclear;hydrothermal
Correct Answer:
Verified
Q1: Most energy for human consumption in the
Q2: Chemically,oil and gas are both _.
A) pure
Q5: Which of the following would make the
Q6: Which of the following would be the
Q8: Hydrocarbons are chain-like or ring-like molecules made
Q9: The greatest depth at which oil is
Q10: Hydrocarbons consisting of short carbon chains are
Q12: In order to produce a commercially viable
Q12: Most of the hydrocarbons within oil and
Q13: Viscosity is defined as a substance's _.
A)
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