Non-renewable energy is the term used to
describe sources of energy that are not easily
renewed.
These include coal, oil, natural gas and nuclear power.
This kind of sources of energy are found in nature and could one day run out.
Rewable energy are considered: wind, solar power, tidal power which are not "consumed" and theoretically are unlimited.
source and more info:
http://www.lshc.co.uk/downloads/Nonrenewable.pdf
http://www.eia.gov/kids/energy.cfm?page=nonrenewable_home-basics
http://www.solarschools.net/resources/stuff/non_renewable_energy.aspx
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