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Rock! Rocks - Rocks are combinations of minerals stuck together (Rice Krispies Treats) (Rice Krispies) There are many different types of rocks… ► All rocks are classified based on how and what they are made of Like potatoes: mashed, baked, scalloped, etc. ► Each come from a plain potato, but were made differently ► ► ► 1. Igneous: formed when molten rock cools 2. Metamorphic: formed when existing rock undergoes intense heat and pressure that alters the rock composition and characteristics 3. Sedimentary: formed from weathered and eroded rock that is deposited and cemented together into new rock The oldest known rock lies in Canada. The Acasta gneiss, a metamorphic rock, is 3.96 billion years old. There is no beginning or end to the Rock Cycle!