They are not. They are substances which are sources of energy. When you burn them chemical energy is changed to heat and light.
Coal burning (for electricity), oil products for transport
coal, oil and natural gas
Oil, coal, and natural gas are the three main types of fossil fuels.
The four main types of nonrenewable energy sources are oil, coal, natural gas, and nuclear energy. These sources are finite and do not naturally replenish at a rate that can sustain human consumption over the long term.
The main types of energy in coal are chemical energy, which is released when coal is burned, and potential energy stored within the coal itself. When coal is burned, the chemical energy is converted into thermal energy, which can be used for generating electricity or heating.
The energy stored in oil and coal is stored as chemical energy. This energy is released when the substances are burned or oxidized.
Chemical energy.
It took billions of years for coal and oil to materialize. Coal and oil are the remains of trees and plants and animals that decayed a long long time ago.. therefore we can't make coal and oil . When the coal and oil are all used up and gone, then they are gone forever. Most nations are moving toward developing renewable energy..things like solar, wind and hydro ..these types of energy will always be available.
1. Oil 2. Coal 3. Natural Gas...
Approximately 1,800 pounds of coal yield the same amount of energy as one barrel of oil. This is because coal has a lower energy density compared to oil, requiring a larger quantity of coal to produce the same amount of energy.
By burning them
Sun, wind, tides, biomass, crude oil, coal. For human body food, water, etc