What are the traditional energy sources?

1, solar energy:

Solar energy is a kind of renewable energy. Refers to the thermal radiation energy of the sun, mainly manifested as the so-called solar rays. In modern times, it is generally used to generate electricity or provide energy for water heaters.

2. Water:

Water is an inorganic substance composed of hydrogen and oxygen, which is nontoxic and drinkable. At normal temperature and pressure, it is a colorless and odorless transparent liquid, which is called the source of human life and an important substance to maintain life, also called hydrogen oxide.

3. Natural gas:

Natural gas refers to all natural gas, including gases formed by various natural processes in the atmosphere, hydrosphere and lithosphere. The commonly used definition of "natural gas" for a long time is a narrow definition from the perspective of energy, which refers to the mixture of hydrocarbon and non-hydrocarbon gases naturally contained in the stratum.

4. Oil:

Petroleum is a thick dark brown liquid, which is called "industrial blood". There are oil reserves in some parts of the upper crust. The main component is a mixture of alkanes, cycloalkanes and aromatic hydrocarbons, which is one of the main targets of geological exploration.

5. Coal:

Coal is a solid combustible mineral gradually formed by ancient plants buried underground through complex biochemical and physical-chemical changes. Coal is called black gold and industrial food. Since18th century, it has been one of the main energy sources used in the human world.