Tuesday, 27 November 2012

Overleigh Geology - Acid Rain

This headstone is made of marble, which is a metamorphic rock that used to be a limestone, transforming into marble when it became heated at a high temperature. Marble dissolves easily in acid, including rain, which is acidic. When this headstone was new the lead lettering sat level with the surface; as the marble has dissolved the lead letters have become raised above the surface.




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