Fourth Grade - Lava Lamps

Fourth Grade learned about the density of liquids by combining oil and water to create lava lamps.  We also discussed how it is a good thing that oil is less dense than water in the case of an oil spill.  Lastly, we used alka seltzer tablets to make the lava lamp come "alive."  The alka seltzer bubbles of carbon dioxide gas take some of the colored water through the oil to create a lava lamp effect.