1.
Substances made up of only hydrogen and carbon atoms.
2.
Formed from the remains of ancient plants and animals, like carbon-rich coal, natural gas, and oil.
3.
A brownish-black rock, easily combustible, made of mostly carbon, providing more than 25% of global primary energy.
4.
A liquid mixture of hydrocarbons providing 31% global primary energy which can be refined to produce fuels such as gasoline, kerosene, and diesel oil.
5.
A colorless, odorless gas consisting of various compounds, mostly the hydrocarbon methane burned to provide 23% of global primary energy supply.
6.
Utilizes the flow of water to generate electricity providing 2.5% global primary energy supply.
7.
Atmospheric motion generated by the uneven heating of Earth's surface by the Sun.
8.
Heat energy extracted from the Earth through hot water or steam.
9.
Energy from captured solar radiation to use for hot water and electricity.
10.
The heaviest element known to occur naturally on Earth when enriched becomes fuel for old nuclear power plants providing 5.0% of global primary energy supply.
11.
The lightest element and component of water is able to store and generate energy through fuel cells and nuclear fusion.
12.
An element that easily bonds with other elements, including oxygen to form carbon-dioxide when burned.
