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Which type of rock is formed 20 kilometers below earths surface?

User TZubiri
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There are three types of rocks and these are igneous, metamorphic and sedimentary rocks. The type of rock that is formed 20 kilometers below the earth's surface is classified as a metamorphic type of rock. Most metamorphic processes takes place a few kilometers below Earth's surface. Hope this answers your question.
User Hellosheikh
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