Each group needs:

• 6 different colors of Play-Doh® or modeling clay; such as 3 different colors for 3 different layers of the Earth; light brown for cap rock; black or dark brown to represent oil, dark blue or another color for sides (see Figures 2 and 3)
• 3 clear plastic drinking straws
• scissors (groups may share)
• Core Sample Worksheet, one per student