I would firstly make a volcano leaving a hole at the top and center, then fill the hole with baking soda, then add vinegar to make it erupt.
make a volcano
You could make a volcano. If you don't like that, use your imagination.
The best science fair project is the one with a volcano. Build a volcano out of PlayDoh or clay and then use vinegar and baking soda to make it erupt.
One easy experimental design for a science fair project is to make a volcano. To create a semblance to lava use baking soda and vinegar. This will spew out of the top of the volcano.
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A good last minute science fair project for a 7th grader would be to make a volcano. Use vinegar and baking soda to put in the crater. This will bubble up and make it look like lava and smoke is coming out of the volcano.
you can't
You should do what mothers have done for ages, help him make a volcano. This simple project just involves shaping a volcano out of clay and leaving the hole. When ready fill the hole with dry ice and you have an exploding volcano. You can also use vinegar
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I used to love Science projects for the Science Fair when I was in school. I would do something simple, but fun, and make a volcano. It requires minimal ingredients, with the main ones being baking soda and vinegar. You can use food coloring to make it more fun!