FORCING CHILDREN TO EAT BROWNIES. I need to assess 6th grade students' understanding of the formation of three different types of rocks. Here's my idea. I challenge the kids to write directions for me to follow in making brownie creations that model the formation of a certain rock type. I make three pans of brownies... on sedimentary, one metamorphic, one igneous, based upon their directions. They discuss the results and are forced to eat some of this nasty, burned stuff! Seriously... does cooking brownies in layers sound do-able? I could alternatively just bring in three trays of brownies and have the kids decifer my technique for baking them and the typw of rck that they represent. That sounds better.....