Coal and Petroleum
Coal and petroleum are two important sources of energy that have been formed over millions of years. They are both fossil fuels, which means they are made from the remains of dead plants and animals that have been subjected to high pressure and temperature over time.

Coal
- Coal is a solid fossil fuel that is formed from the remains of plants that lived millions of years ago.
- It is primarily made of carbon and has high energy content, making it a valuable source of energy.
- Coal is mined from the earth's crust and is used for various purposes such as electricity generation, heating, and industrial processes.
- There are different types of coal, including lignite, bituminous, and anthracite, with varying carbon content and energy levels.

Petroleum
- Petroleum, also known as crude oil, is a liquid fossil fuel that is formed from the remains of marine plants and animals.
- It is a complex mixture of hydrocarbons and is found underground in reservoirs.
- Petroleum is refined to produce various products such as gasoline, diesel, and jet fuel, which are used in transportation, heating, and manufacturing.
- It is a versatile source of energy that plays a crucial role in the global economy.
Both coal and petroleum are non-renewable resources, meaning they cannot be replenished in a short period of time. Their extraction and use have environmental impacts such as air and water pollution, greenhouse gas emissions, and habitat destruction. Therefore, it is important to explore alternative sources of energy to reduce reliance on these fossil fuels and mitigate their negative effects on the environment.