Linked from
The 17 pages that link to Petroleum, each with the reason it gives.
HydrocarbonRelated: Petroleum is separated and processed into fuels and chemical feedstocks.
Organic compoundRelated: Petroleum is a major source of organic feedstocks and fuels.
Greek fireRelated: Petroleum-based substances are among the proposed ingredients of Greek fire.
NonaneRelated: Nonane occurs among the hydrocarbons in petroleum fractions.
Petrol engineRelated: Petrol engines depend on refined petroleum as their principal fuel source.