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Why are metamorphic rocks harder than igneous rock and sedimentary rocks

User Blanco
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Metamorphic rocks are almost always harder than sedimentary rocks. They are generally as hard and sometimes harder than igneous rocks. They form the roots of many mountain chains and are exposed to the surface after the softer outer layers of rocks are eroded away.⇔⇔

User Novlette
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because metamorphic is created by a igneous or sedimentary rock heating up and changing into a metamorphic rock
User Sysasa
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