What happens when you place a separator sheet between a column of red-colored warm water on top of blue-colroed warm water and slowly slide the separator out? What happens if the cold water is on the top and the warm water is on the bottom? Use this lab to find out the answers to these questions and determine if density is an intrinsic or extrinsic property of matter. Claire Zurbuck developed this kit to teach about water currents, air currents, and convection. Includes materials for five student groups and instructions. Grades 4–8.