1. Fill a bottle halfway with vinegar.

2. Put the bottle in the middle of a large pan. (You can then put dirt around the bottle until only the neck is showing, and that will become your volcano.)

3.Get a tablespoon of baking soda and put it in a piece of tissue paper, roll it thin enough so it can fit inside the bottle, then tie both ends with thread.

4.Put the baking soda packet into the bottle, but don't let it touch the vinegar.