What is the only rock that humans can eat?

sue943

Chalk - otherwise known as Calcium carbonate - a soft form of limestone Dec 11 00, 8:56 PM

l3i7l

Pass the SALT please. Dec 11 00, 11:24 PM

JSBach

Natural table salt (NaCl) as well as other types of soluble solids (MSG), but chalk as well (although not very good). Dec 12 00, 1:37 PM

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