Culminating lab after a 1-2 week introduction to the concept of density which should include practice, discovery, math problems, measuring, and use of equipment including graduated cylinders, triple beam balances, water displacement, and mass/volume comparisons. This is best used with the density kits found here: http://www.pitsco.com/Science/Project_Kits/Grades_9-12/Density_Kit Students also introduced to the density of rocks in the earth's crust, so three crustal rock samples per group must also be made available.