23. मानव के लिए शैतानों के तीन महत्वपूर्ण कार्य का वर्णन कीजिए ?
Describe three important functions of rocks for humans.
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1) . It is used for production of lime , paper, glass etc. 2) They are used to make cement which is used on homes. 3) They are also valuable sources of
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