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 <i>lamp</i> 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&reg; lava lamp. How will changing the temperature of the ingredients change the behavior of the colorful blobs in your lava lamp?