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• This ocean is filled with tiny plants andanimals like plankton . Over millions of years the plants and animals die andsink to thebottom of the ocean . Later, all these dead
plankton bodies are covered in sand and le heat and pressure, but these thick
layers of dead bodies transform ``` intolakes of underground oil . Many of these lakes of oil are found underneath our currentoceans . Others are found on land, where
oceans used to be millions of years ago .
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