Each group needs:

• 3 transparencies with a grid of -cm² boxes photocopied on it (use Blank Graph Paper for the grid)
• 1 graduated cylinder (at least 10 ml)
• materials from one of the following three different experimental groups:

1. Viscosity-measuring group materials: 8 ml liquid soap, 1 T salt, 5 ml water, 4 small cups, eyedropper
2. Volume-measuring group materials: 18 ml liquid soap, small cup
3. Slope-measuring group materials: 9 ml liquid soap, 1 pencil, small cup, and 1 small circular wooden dowel (such as a medical applicator stick, 1/12-inch diameter x 6-inch long [~2.1-mm x 15.2-cm], available from medical products companies, such as Puritan Medical Products)

• paper towels, sponges and water (for clean-up)
• Measuring Lava Flow Worksheet, one per student
• (optional) cardboard box or plastic tub to organize a group's various materials
• (optional) containers or squeeze bottles for liquid soap (to make measuring easier and tidier)
• (optional) plastic pipettes, instead of pouring soap

For the teacher to demonstrate the procedure:

• 1 grid transparency and few ml of liquid soap
• (optional) overhead projector