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Sidewalk chalk are typically large colored (and sometimes white or cream) sticks of chalk (calcium sulfate rather than rock chalk, calcium carbonate) mostly used for drawing on pavement or cement sidewalk. It is sometimes used by children to draw a four square court or a hopscotch board. Blackboard chalk is typically shorter. There are several different types of sidewalk chalk, typically coming in solid-colored sticks. 3-D sidewalk chalk sets, in which each stick of chalk is created with two particular colors that appear 3-dimensional when viewed through the 3-D glasses that come with the chalk, also exist.〔3-D sidewalk chalk. (2008). Scholastic Parent & Child, 16(2), 14.〕 Sidewalk chalk can be cheaply homemade.〔Make your own sidewalk chalk. (1998, July 21). Christian Science Monitor. 13.〕 ==Use== Sidewalk chalk is used at some universities to advertise for events, especially where there is much concrete. Prohibitions are set for where students can chalk, usually limiting it to areas that will be washed away with rain, or areas which are set to be cleaned of chalk markings. Some teachers promote use of sidewalk chalk on a carpet as an interactive teaching tool.〔Davenport, J. (2007). Classroom essentials. Teacher Magazine, 18(4), 16.〕 Although sidewalk chalk is created to allow people to draw on sidewalks or pavement, some law enforcement agencies may prohibit sidewalk drawing in certain areas without first being requested for authorization.〔Boretz, A., & Beever, J. (2010). Where the sidewalk ends. Publishers Weekly, 257(41), 34.〕 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「sidewalk chalk」の詳細全文を読む スポンサード リンク
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