Let's look at the differences between Coal and Petroleum
| Coal | Petroleum |
| Coal is found in solid state | Petroleum is found in liquid state |
| Cost of transportation of coal is high since it is hard and bulky | Cost of transportation of petroleum is low because it is a liquid |
| Coal emits smoke, ash and other harmful gases | The emission of Petroleum is less than that of Coal |
| Extraction cost of Coal is High | Extraction cost of Petroleum is low |
| Coal is cheap | Petroleum is relatively expensive |
