Sidewalk chalk

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.

单词	Pavement chalk
释义	Pavement chalk 英语百科 Sidewalk chalk 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.
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Pavement chalk

Sidewalk chalk