Renewable Energy — Chapter Summary

Energy is the capacity to do

Energy is the capacity to do work. It exists in forms such as heat, light, electrical, chemical, and mechanical energy, and it can change from one for

These are energy sources that have

These are energy sources that have been used for a long time and are formed over very long geological periods. Coal, petroleum, and natural gas are th

Coal is a solid fossil fuel

Coal is a solid fossil fuel formed from the remains of plants buried under layers of soil and rock millions of years ago. It is mined from the Earth a

Petroleum

Petroleum, also called crude oil, is a liquid fossil fuel found deep beneath the Earth’s surface. It is obtained by drilling and refined into petrol,

Natural gas is a gaseous fossil

Natural gas is a gaseous fossil fuel often found with petroleum deposits. It is considered the cleanest among conventional energy sources because it b