My grandson Lucas made an amazing edible work of art for his 8th grade science project - check out the orange skittles fossils, different sedimentary layers, and the volcano with chocolate lava! Also impressive are the informative labels. Thanks, Lucas, for allowing me to share it!
It turns out you can buy sugar paper and sugar pens! Very handy when your cake requires informative labels.
Lucas' cake is a definite step up from one of my favorite classroom projects--peanut butter and jelly geology done some years ago at a school I visited. The jelly are the tar pits and pretzels are the fossil bones.