geog問題....關於chemical weathering

Carbonation is the process in which atmospheric carbon dioxide leads to solution weathering. Carbonation occurs on rocks which contain calcium carbonate such as limestone and chalk. Carbonation takes place when rain combines with carbon dioxide to form a weak carbonic acid which reacts with calcium carbonate (the limestone) and forms calcium bicarbonate. This process speeds up with a decrease in temperature and therefore is a large feature of glacial weathering.
The reactions as follows:





CO2

+

H2O

->

H2CO3


carbon dioxide

+

water

->

carbonic acid













H2CO3

+

CaCO3

->

Ca(HCO3)2


carbonic acid

+

calcium carbonate

->

calcium bicarbonate

It will be more active in cold place.