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http://www.manythings.org/

http://coolmath4kids.com

http://www.funbrain.com

http://www.garfield.com/fungames/scavengerhunt/scavengerhunt.html

http://www.garfield.com/fungames/scavengerhunt2/scavengerhunt2.htm

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http://library.thinkquest.org/03oct/00472/Were%20volcanos%20are%20fond%20Volcanos%20are%20found%20in%20many%20parts%20of%20the.htm