Here are pictures of our latest volcano attempt. It turned out better than our previous attempt but still wasn't as great as I was expecting.
Supplies- Clear bottle, plastic tarp/tray, water, oil, food coloring, and Alka-Seltzer tablets.
Fill the bottle a little more then half way with water. Fill the rest of the way with oil.
Add food coloring.
Add Alka-Seltzer tablets.
Watch the volcano.
You can redo this a number of times and still get the same reaction. I allowed her to add a couple drops of food coloring each time so each reaction looked a little different.