Millions of years ago prehistoric algae and zooplankton died and fell to the bottom of the sea, The remains began to be decomposed by bacteria, Over time layers of mud and rock were laid down on top of the decomposing remains pushing them deeper towards the warmth of the Earth's core, The increasing layers of mud and rock created an absence of oxygen and the remains were only partially decomposed, The huge weight of the layers put the dead algae and zooplankton under high pressures, Being subjected to these conditions over millions of years formed crude oil.

Formation of crude oil KS4

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