What Is Chalk?
Chalk is a soft, white limestone. The chemical composition is calcium carbonate with minor amounts of silt and clay. It was formed from the
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Chalk is a soft, white limestone. The chemical composition is calcium carbonate with minor amounts of silt and clay. It was formed from the
Here’s one of the Bizarre incident happened to me which i am sharing with you. My School’s superintendent looked rather downcast as he read
This incident occurred when I was studying in fourth class. One day my cousin came to meet me during the school hours. It was our history p