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When sulfurous, sulfuric, and nitric acids in polluted air and rain react with the calcite in marble and limestone, the calcite dissolves. In exposed areas of buildings and statues, we see roughened surfaces, removal of material, and loss of carved details. Stone surface material may be lost all over or only in spots that are more reactive.

Robert Plant has spoken about the tragic death of his son Karac over four decades ago. Karac died from a stomach virus aged just five in 1977 when Robert was on tour with Led Zeppelin in North America, and the singer went on to write ''All My Love'' in his late .


The main agents of chemical weathering are acid precipatation, lichens, and other plants like mold decaying the rock. How can lichens cause mechanical weathering? they eat away the surface of a rock

Apr 25, 2017· Chemical weathering does not cause physical damage to rock but rather is a reaction between the chemical composition of the rock and outside weathering can make a rock more vulnerable to physical weathering forces. For instance, oxidation is a process by which oxygen in the air reacts to chemicals in the rock. Iron in rocks can react with oxygen to form iron oxide, or rust.

Wet weather and plants are usually a match made in heaven. However, sometimes there can be too much of a good thing. Excessive rain on plants can cause plenty of trouble in the garden. Overly wet weather causes diseases via bacterial and fungal pathogens fostered by long term moisture on foliage and root systems.

In all cases, the rocks break down as a result of expansion due to factors such as seasonal freezing of water or growth of salt crystals in rock fissures, removal of overlying layers by erosion (causing large sheets of rock to peel off as a result of the decrease in pressure), and biological activity, which includes the action of animals ...
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