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What is the name and nature of stones that expand like a sponge when heated by fire?


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May 12, 2012 11:31AM

it is a very specific answer. When you go on holiday camping or something, you have like little fires to warm you up, and stones are just like rock, (the rock you eat) it is rock hard at first and then when you suck it it gos soft. But ovbiously you dont suck stones.