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  1. ... which contain calcium carbonate such as limestone and chalk . Carbonation takes place when rain ... calcium bicarbonate. This process speeds up with a decrease in temperature and therefore is a large feature...

    分類:科學及數學 > 地理學 2007年10月26日

  2. ... which contain calcium carbonate such as limestone and chalk . This takes place when rain combines... calcium bicarbonate. This process speeds up with a decrease in temperature and therefore is a large feature...

    分類:科學及數學 > 地理學 2006年12月27日

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