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  1. ... 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

  2. ... Heinrich Schultz (1724): a silver and chalk mixture darkens under exposure to light. However...would be almost 150 years before technology caught up to the point where this was possible. Early photographic...

    分類:家用電器 > 相機 2006年12月09日

  3. ..._Portrait_by_Volterra.jpg Chalk portrait of Michelangelo by Daniele da... versatility in the disciplines he took up was of such a high order that he is often...

    分類:文學及人文學 > 歷史 2006年12月02日

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