Which is the rock which when exposed to atmosphere it starts to crack but when it is not exposed it is sound rock?
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ଘଙଛ4ଚଯଠୀଋଵହଢଗତଙଦଦଡଣଠଛୀଚା46894ଘଵ଼ଵ଼ଵୌଣଢଯଯଗଛଡଥଗଦଣୟଲ ଫଭଶ଼ଷଯଶୟଘୟଥ
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