+Oil is a dark, viscous liquid, formed over millennia beneath the Earth's crust. This ancient [Energy source](/wiki/energy_source) powers much of our modern world, transforming into everything from [Fuel](/wiki/fuel) to plastics. Its extraction and use profoundly shape global economies and environmental policy.
+## See also
+- [Fossil fuel](/wiki/fossil_fuel)
+- [Petroleum](/wiki/petroleum)
+- [Refining](/wiki/refining)
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