You don't really need a kit

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From: Julie in MN (209.162.49.250)
Subject: You don't really need a kit
Date: April 10, 2009 at 3:55 pm PST

In Reply to: Model Volcano Kit posted by aaashmschoolmom on April 9, 2009 at 11:11 am:

You don't really need a kit for the "explosion" part. Just put a couple tablespoons of baking soda in something, & add vinegar. Some add a little dishsoap for foam or a little food coloring.

Are you wanting to build the mountain part? You can build that out of clay, if you like. Just make sure it won't dissolve when wet. We have a little plastic mountain. You can add little model dinosaurs & such for fun :o)

For buying a kit, I always trust Home Science Tools. Here's the experiment written up: http://www.hometrainingtools.com/articles/earth-science-projects.html
This kit looks nice http://www.hometrainingtools.com/product_categories/63/products/3639-amazing-volcanoes-kit

Have fun! My son just demonstrated how to build a volcano as part of a speech class.
Julie