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The main component is methane. Other components include ethane, propane, butane, and many other combustible hydrocarbons. Raw natural gas may also contain water vapor, hydrogen sulfide, carbon dioxide, nitrogen, and helium
b =Gasoline is made from crude oil. The crude oil pumped out of the ground is a black liquid called petroleum. This liquid contains hydrocarbons, and the carbon atoms in crude oil link together in chains of different lengths. ... Methane is a gas so light that it floats like helium.
c=,Carbon dioxide
Carbon dioxide was removed by photosynthesis. Carbon dioxide was produced by respiration.
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