Note 1: Erosion is a general characteristic of biodegradation by cells that adhere to a surface and the molar mass of the bulk does not change, basically. Note 2: Chemical degradation can present the characteristics of cell-mediated erosion when the rate of chemical chain scission is greater than the rate of penetration of the cleaving chemical re...
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http://en.wikipedia.org/wiki/Bioerosion
the erosion of hard ocean substrates by living organisms through a number of mechanisms.
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http://en.wikipedia.org/wiki/Glossary_of_geology
bioerosion Erosion resulting from the direct action of living organisms as with the feeding of epibionts on reefs by urchins and grazing fish which results in scraping off bits of calcium carbonate. It is believed that the majority of sand-sized particles on reefs probably come from grazing activities.
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http://www.wordinfo.info/words/index/info/view_unit/2819/12
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