Each group needs the following:

• 1 clear plastic cup
• 50 mL sand
• 50 mL gravel
• 50 mL clay
• 2–3 tablespoons baking soda
• 20 mL vinegar + 3 drops food coloring
• 1 plastic dropper/pipette
• 1 ruler (cm)
• 1 stopwatch/timer
• 1 spoon
• 1 Design Sheet per student
• 1 pair of nitrile gloves per student
• 1 pair of safety goggles per student
• paper towels