♻️ap environmental science review

Petroleum

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 2025

Definition

Petroleum, also known as crude oil, is a naturally occurring liquid mixture composed mainly of hydrocarbons. It forms over millions of years from the remains of marine organisms buried in sediments.