Learners conduct two activities to investigate two properties of liquids: density and viscosity. In a clear container, learners stack 7 different liquids which will layer according to their density. For the second part, learners "race" drops of different liquids to see how their viscosities compare. Learners can record their layered liquids with drawings and/or photographs. A related activity, "Floating and Falling Flows", allows learners to investigate the interactions of liquids as well. Resource contains vocabulary definitions and suggestions for assessment.