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Cities specialized in Petroleum requires to be extracted from the ground extract and processed into more valuable resourcesprocess oil for profit.
*Natural resources such as ore, coal and oil in a region are finite. *Make sure to inspect the region to find where the oil deposits are before you claim your city. Petroleum extracted from the ground can be processed into more valuable resources. *A refinery can be built to convert petroleum into fuel and plastic. Petroleum is one of the [[big businesses|big business]] specializations. It has it own global [[leaderboard]]. ==Petroleum Structures==Oil Well- Petroleum HQ- Oil Refinery-