Websites for building a simple and fun volcano

http://www.geology.sdsu.edu/how_volcanoes_work/

http://library.thinkquest.org/J002744/adlm-vol.html

http://www.quanano.co.uk/volcano.php

http://chemistry.about.com/cs/howtos/ht/buildavolcano.htm

 http://volcano.und.nodak.edu/vwdocs/volc_models/models.html

 http://cns.utexas.edu/uteachoutreach/kids/volcano.html

 http://www.spartechsoftware.com/reeko/experiments/volcano.htm

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I would suggest playdough for the actual volcano. You can make that with 1/2 cup salt, 1/2 cup water, and 1 cup of flour. Once you have the volcano built, bake it at 400F for a couple of hours until it gets hard. Make sure to have a big enough pocket to put the mentos and soda (or baking soda and vinegar) into