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primary
The Sun is the primary source of all energy on Earth.
Geothermal energy utilization does not cause air pollution as fossil fuelsGeothermal energy is renewable source of energy while fossil fuel is not.
sunlight
Sun
The term clean source of energy refers to only primary energy sources as wind or solar energy. Electricity, by definition, is not a primary energy source. It is a secondary energy source that is could be produced by a clean energy source as wind or any renewable primary energy source or produced by fossil energy source as oil, natural gas, or coal.
The Sun isn't our primary source of energy. The world still relies on burning fossil fuels as a main source of energy. Solar power only provides one percent of the world's electricity production.
Well when you burn fossil fuels you get alot of the energy that we use like petroluem, natural gas, and coal.
Hydrogen is not a renewable fuel. It is a secondary energy source (or an energy carrier) that could be produced using another primary energy source. Hydrogen could be produced using either renewable primary energy source (e.g. solar energy), nuclear energy, or by using fossil fuel (e.g. natural gas)
primary because a fossil is a thing you first see. if it was a book about fossils then its secondary.
Oil
The United States relies mainly on fossil fuels as the primary energy source. According to the numbers given in the United States Department of Energy website, fossil fuels (coal, oil and natural gas) currently provide over 85% of the energy consumed in the United states.
fossil fuels can be used as an energy source to power all vehicles and most machinery
primary
Carbohydrates are the body's primary and immediate source of energy.
Carbohydrates are the body's primary and immediate source of energy.
Nuclear energy that is the source of sun energy which in turn is the source of fossil and renewable energies.