Lava Lamp Fun!!!

We made a lava lamp today. I used one of our big plastic test tubes and mixed one part water some food coloring and 3 parts oil. Then broke up generic Alka Seltzer tablets and let her drop them in. We watched this for a few minutes adding one piece when the first one fizzled out. Then she wanted to put multiple pieces in at once. Will this make more bubbles or less bubbles? She said less. So we tried. Well, it made more!

***No more updating everything from my IPhone.  I was informed it autocorrected to say antacid tablets instead of Alka Seltzer (made it one word by accident and IPhone didn't understand it.  Antacid won't do anything.  Sorry about that).***