Question

why stone is so hard
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Answer 1

Answer:

Usually because they have been subjected to huge compressive forces or high temperatures the hardest have been subjected to heat and pressure , that is of course is diamond . Quartz and granite come close behind . But there are rocks at the other end of the scale like talc , soapstone and graphite these are very soft .

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Answer 2

Answer:

as distance between 2 molecules is absent in them

Explanation:

Hope it helps you