Question Constellation Sign up for free AQA · GCSE · Combined Science · Higher
Formation of crude oil
Describe how crude oil is formed.
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Marking points
- 1 State that crude oil comes from plankton/biomass or marine organisms.
- 2 State that the remains were buried in mud/sediments or compressed under mud/sedimentary rock.
- 3 State that this happened over a long period of time or millions of years.
Full-mark answer
Crude oil formed from plankton or marine biomass that was buried in mud and compressed under sedimentary rock. This happened over millions of years.