A liquid mixture of complex hydrocarbon compounds; used widely as a fuel source

Extracting ore or minerals from the ground

Coal, oil, natural gas, and other fuels that are ancient remains of plants and animals.

A machine for producing power in which a wheel or rotor is made to revolve by a fast-moving flow of water, steam, gas, or air.

Energy derived from the heat in the interior of the earth

Energy from the sun

The act of cutting down trees, can cause soil erosion

Movement of people from rural areas to cities

Urban areas that heat up more quickly and retain heat better than non-urban areas