Petroleum was formed at a later time than coal from plant and animals that lived in shallow seas.石油由植物和生长 在浅海的动物形成，其形成时间比煤晚 0◼ Petroleum was formed at a later time than coal from plant and animals that lived in shallow seas.石油由植物和生长 在浅海的动物形成，其形成时间比煤晚