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Dirt is unclean matter, especially when in contact with a person's clothes, skin or possessions when they are said to become dirty. Common types of dirt include: * dust — a general powder of organic or mineral matter * filth — foul matter such as excrement * grime — a black, ingrained dust such as soot * soil — the mix of clay, sand and humus which lies over the bedrock ==Exhibitions and studies== A season of artworks and exhibits on the theme of dirt was sponsored by the Wellcome Trust in 2011. The centrepiece was an exhibition at the Wellcome Collection showing pictures and histories of notable dirt such as the great dust heaps at Euston and King's Cross in the 19th century and the Fresh Kills landfill which was once the world's largest. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「dirt」の詳細全文を読む スポンサード リンク
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