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Pure earth does not petrify, because the predominance of dryness over [i.e. in] the earth endows it not with coherence but rather with crumbliness. In general, stone is formed in two ways only (a) through the hardening of clay, and (b) by the congelation [of waters].
- Avicenna Excerpt from Congelatione et Conglutinatione Lapidium (February 13, 2012)
- Avicenna Excerpt from Congelatione et Conglutinatione Lapidium (February 13, 2012)Flag for review
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