Linked from
The 14 pages that link to Crude oil, each with the reason it gives.
PetroleumBroader topic: Crude oil is the liquid portion most commonly meant by petroleum.
Abadan RefineryRelated: It was the feedstock transported to Abadan for processing.
Bulk cargoBroader topic: Crude oil is a major liquid bulk cargo carried by tankers.
Petroleum industryRelated: Crude oil is the main feedstock processed by the industry's refineries.
BitumenRelated: Refining crude oil can yield the heavy residue that becomes bitumen.
Complex mixtureBroader topic: Its many compounds require extensive separation and characterization.