The origin of crude oil
3 marks · EasyCrude oil is formed over an extremely long period of time. Answer all parts.
What happens to the remains of sea plants and animals after they die?
State two conditions required for these remains to change into crude oil.
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(a) They are buried by layers of sediment
(b) High temperature and high pressure · must show heat, pressure
Common mistakes: Naming wrong conditions like sunlight
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Marking points
B1 (a) · 1 mark · Describes burial of remains under sediment
B1 (b) · 2 marks · States both: high temperature (heat) and high pressure required for formation of crude oil
Worked solution
a) The remains are buried by layers of sediment.
b) The remains need high temperature (heat) and high pressure to turn into crude oil.