Metamorphic rocks are the hardest.Why?
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Metamorphic rocks are almost always harder than sedimentary 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...
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Metamorphic rocks are almost always harder than sedimentary 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.
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