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Limestone - Sedimentary rocks
Discover the Beauty of Chalk: A Soft and Porous Sedimentary Rock
Chalk | Properties, Composition, Formation and Uses
Chalk - Geology Superstore
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Chalk: A biological limestone formed from shell debris
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Chalk: Mineral information, data and localities.
Chalk
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Chalk - Wikipedia
Chalk | Properties, Composition, Formation and Uses
Chalk: A biological limestone formed from shell debris