Group 1: Sedimentary rock, Formed in layers., Formed over time when layers of sand and mud turn into rock., Most fossils are found in this type of rock., Group 2: Metamorphic rock, Rocks that have changed from another type of rock., Formed by pressure and heat., Most mountains are made of this type of rock., Group 3: Igneous rock, Formed when volcanoes erupt and lava cools., Name means from fire or heat., Least common type of rock.,

Rock Groups

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