Chalk

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Please copy/paste the following text to properly cite this How Stuff Works article:

"Chalk." 30 August 2007. HowStuffWorks.com. <http://reference.howstuffworks.com/chalk-encyclopedia.htm> 09 July 2008.

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Chalk is a soft, fine-grained white limestone. It was formed as a mud on the bottom of an ancient sea. It differs from many pure, fine-grained limestones only in still being soft and easily rubbed off. That is, it did not change into hard rock.

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Chalk

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