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I assume you know coal is a solid and petroleum is a liquid.
They were created in different ways. Coal was made from land based plant life, mainly ferns, that became submerged, such as being in flooded forests or swamps. Since they were under water these dead plants did not decay completely. Over time they were were covered by sediment. As they were buried deeper and deeper the temperature and the pressure of the sediment compressed it and turned it into coal.
Oil was created by a similar process but it was made from sea life (plankton) that died and drifted to the bottom of a lake or sea.
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