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One of the most dramatic outcrops of chalk is along the south coast of [[England]] where it forms the "white cliffs of [[Dover]]", the Seven Sisters and parts of England's [[Jurassic Coast]], now a [[World Heritage Site]] in recognition of its unusual geology.
One of the most dramatic outcrops of chalk is along the south coast of [[England]] where it forms the "white cliffs of [[Dover]]", the Seven Sisters and parts of England's [[Jurassic Coast]], now a [[World Heritage Site]] in recognition of its unusual geology.
As a useful commodity, chalk has been replaced by other substances. For example, the "chalk" that is used in blackboard writing or in sidewalk chalk is actually [[gypsum]].
[[File:Chalk.jpg|thumb|left|200px|writing chalk]]
As a useful commodity, chalk has been replaced by other substances. For example, the "chalk" that is used in blackboard writing or in sidewalk chalk is actually [[gypsum]]. So, in common usage, chalk refers to a [[cylinder]]-shaped piece of gypsum that is used as a specialized writing implement.
[[Category:Sedimentary Rocks]]
[[Category:Sedimentary Rocks]]