Chipping+Flaking

By: Taylor and Tim
 * Chipping and Flaking[[image:http://www.es.ucl.ac.uk/schools/london_fieldwork/col/gravestone_weathering/images/introsandstone.jpg width="288" height="378" align="right"]]**

Chipping and flaking happens when the substance starts to weather and the outer layer begins to peel and flake off like paint.


 * Sandstone**- [|Sandstone] can produce flakes which usually remain attached to the rock and become the home of many small creatures. When the flakes detach, it leaves a very rough surface on the gravestones. Decomposition leaves a black crust on the headstones.


 * Limestone**- [|Limestone] is very prone to weathering by [|acid rain]. Limestone can contain [|fossils], which will stick out of the stone after the limestone has weathered. Acid rain may cause chips of the stone to fall off.


 * Marble**- [|Marble] is a weak stone, and loses its luster and smoothness after only ten to twenty years. After this time, marble becomes quite gritty and dull. If you were to touch a marble stone, you'd see that it contains grains that will easily fall off. Over time as the grains are removed, the stone becomes rough and gritty. These grains may have been holding areas of the stone together, and in their absence the stone will easily chip and flake.

"Sandstone, Limestone, Marble." __Department of earth sciences__. 07 Jan 2007. Department of earth sciences. 3 Apr 2007 .
 * Citation: (Picture and Information)**