Assertion: crude oil | /r/HasProperty | separated into natural gas
Facets:
Source sentences:
text: According to the American Heritage Dictionary, petroleum is a "thick, flammable, yellow-to-black mixture of gaseous, liquid, and solid hydrocarbons that occurs naturally beneath the earth's surface, can be separated into fractions including natural gas, gasoline, naphtha, kerosene, fuel, and lubricating oils, paraffin wax, and asphalt and is used as raw material for a wide variety of derivative products.