Humans are quickly depleting Earth's fossil fuels and locating them is becoming increasingly difficult! Layered muffins are used for models as young geologists take core samples in order to determine the presence of oil. Consider first teaching about the carbon cycle and fossil fuels to give youngsters the background knowledge that will make this activity more meaningful. Be aware that significant preparation time is required as the teacher must bake the special muffins for the activity, but it will be well worth the time!