Simulation of Igneous Rocks
Heath bars can simulate Igneous rocks. The inside candy has very small crystal size so that makes it a extrusive formation.
Peanut brittle, fudge, and sea form candy are other examples that could be used in a class
Simulation of Sedimentary Rocks
Rice Krispise are a great example of a Detritial sedimentary rock. They are made up of bits and pieces and held together by the marshmallow.
The other form of Sedimentary rock would be chemical sedimentary.
Simulation of Metamorphic Rocks
Butterfingers are a great examples of a metamorphic rock, in specific it is a schist which is a type of Folicated schist. Meaning that you can see the bands of minerals.
Anything that goes through a heat and pressure change would be a good example to use for this.
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