Geology

A while back, my daughter brought home a sandwich bag layered from top to bottom with baby marshmallows, crumbled graham crackers, chocolate chips, and white sugar. This represented the rock layers of the earth's crust. I forget which cookie recipe ingredients matched up with which rock layer, but I thought this was an effective way to teach geology. The instruction sheet attached to the sandwich bag said to heat the ingredients, pour it into a glass bottle, and then observe another type of rock layering. I tried this, but ended up burning the ingredients at the bottom of the pan. Nonetheless, the kids and I had a fun time with this geology lesson.