http://www.eschooltoday.com/energy/kinds-of-energy/what-is-thermal-energy.html

http://study.com/academy/lesson/what-is-thermal-energy-definition-examples.html

http://www.fun-facts.org.uk/energy_facts/thermal-energy.htm

http://physics.tutorvista.com/energy/thermal-energy.html

http://www.buzzle.com/articles/thermal-energy-facts.html

http://solarenergyfactsblog.com/solar-thermal-energy-facts/

https://www.reference.com/science/uses-heat-energy-220be674b88e0ef5

http://science.howstuffworks.com/environmental/green-tech/energy-production/solar-thermal-power.htm

http://www.greenmatch.co.uk/blog/2014/08/5-advantages-and-5-disadvantages-of-solar-energy

http://www.greenmatch.co.uk/blog/2014/04/advantages-and-disadvantages-of-geothermal-energy

http://www.softschools.com/facts/energy/thermal_energy_facts/402/

https://www.reference.com/science/thermal-energy-used-cd6635831221da64

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Pictures:

https://www.reference.com/science/thermal-energy-used-cd6635831221da64

https://www3.epa.gov/climatechange/kids/solutions/technologies/solar.html

https://www3.epa.gov/climatechange/kids/solutions/technologies/solar.html

https://www3.epa.gov/climatechange/kids/solutions/technologies/solar.html

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"Physics with Modern Physics" by Randall D. Knight, Third Edition Copyright 2013,2008,2004