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/Ëpet.rÉª.kÉËr/ /Ëpet.rÉª.kÉËr/ specialized. âº the smell produced when rain falls on dry ground, usually experienced as being pleasant. (Definition of âpetrichorâ from the Cambridge Advanced Learner's Dictionary & Thesaurus Â© Cambridge University Press)
Petrification (petros means stone) occurs when the organic matter is completely replaced by minerals and the fossil is turned to stone. This generally occurs by filling the pores of the tissue, and inter and intra cellular spaces with minerals, then dissolving the organic matter and replacing it with minerals. This method reproduces the original tissue in every detail. This kind of fossilization occurs in both hard and soft tissues. An example of this kind of fossilization is petrified wood. The process of permineralization. The ground water generally do not contain pure water molecules alone. It is hard to some