http://www.s-cool.co.uk/gcse/physics/energy-transfers/revise-it/how-does-heat-energy-move
http://www.pbslearningmedia.org/asset/lsps07_int_heattransfer/
http://www.webquest.hawaii.edu/kahihi/puzzles/energytransfer/energy2.php
http://studyjams.scholastic.com/studyjams/jams/science/energy-light-sound/heat.htm
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