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Why are rocks hard?


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The rocks you see around you - the mountains, canyons & riverbeds, are all made of minerals. A rock is made up of 2 or...

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Rocks are hard because the center is usual molten rock. Can I answer anything else for you? ChaCha!

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Igneous rocks form when molten lava (magma) cools and turn to solid rock. Thanks for using ChaCha!!

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