To simulate how metamorphic rock is created by both pressure and heat, we built metamorphic rock sandwiches! Each layer and ingredient of this three stacked sandwich was a layer of sediment. Students had peanut butter and jelly, gummy worm and chocolate chip, and marshmallow layers on three slices of bread. Once they created this on a paper plate, they placed another paper plate on top of it, put the whole thing in a gallon sized ziplock bag, and added some pressure to the sandwich. After smashing, folding and crumpling the plates and sandwich in a bag, we then heated the metamorphic sandwich in a microwave. The result was an entirely new sandwich that looked nothing like it did before, much like metamorphic rock comes from a previous rock type, but goes through an entire change after being heated and pressurized.
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