Make an Alka-Seltzer Powered Lava Lamp

Have you ever seen a lava lamp? They were the height of 1960's "groovy" room decorations. A few minutes after turning it on, a lava lamp has blobs of colored liquid floating towards the top of the lamp and then drifting back down. Making an actual lava lamp that you plug in would require some effort and unusual supplies, but you can create a non-electric version in just a few minutes with the help of the fizzing power of Alka-Seltzer. In this activity you can find out how to make your own Alka-Seltzer® lava lamp. How will changing the temperature of the ingredients change the behavior of the colorful blobs in your lava lamp?