http://www.youtube.com/watch?v=0_c0ZzZfC8c
http://www.youtube.com/watch?v=6-rVAeGrMsg
http://www.youtube.com/watch?v=OzSgk772OQU
Solid, liquid and gas
http://www.youtube.com/watch?v=btGu9FWSPtc&list=PL8i8-h_g3yAveXMVZmS3nf9dcXWmEp312#t=32
Let´s play
http://www.bbc.co.uk/bitesize/ks2/science/materials/changing_state/play/
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