Tuesday, 12 June 2012

Weathering processes

"It is customary to associated particular types of gravestones or environments with particular weathering processes. Marble gravestones, for example, are expected or rather assumed, to decay mainly by dissolution by acidic rainfall (remembering that natural rainfall is slightly acidic anyway being a weak carbonic acid with a pH of 5.6) Dissolution is assumed to remove matrix and grains from the surface of the gravestone producing a 'sugary' surface". [For the full story on the decay of monuments from the University of Portsmouth (UK) see this link.]

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