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What are the three main groups of rocks and how are they formed
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What are the three main groups of rocks and how are they formed

User SilverFoxA
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The main three groups of rocks are metamorphic, sedimentary, and igneous. Igneous rocks are formed from melted lava and volcanic ashes. Metamorphic is a mixture of sedimentary and igneous and sedimentary are formed at or near the eat the surface by accumulation of sediment.
User Shivon
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