Which of the following was NOT a new use for petroleum discovered in the early 20th Century?
Airplanes used petroleum for cross-Atlantic flights.
Refineries began producing whale oil because it burned brighter and with less smoke than kerosene.
Railroads converted their locomotive boilers to ones that used fuel oil.
Builders put in natural gas systems to heat and light homes and businesses.
Henry Ford began mass-producing automobiles powered by gasoline.