Explore solids and liquids with the classic density tower. After discovering the density of liquids, kids can test how dense certain solids are. Which solids sink? Which ones float?Click herefor the explanation. If you want to make a smaller tower, you can experiment with the 7-layer density columnhere. You can adjust the colors of your 7-layer density column and make a rainbow tower! You can also integrate math with this activity and practice fractions!