Chalk: A biological limestone formed from shell debris
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Chalk - Wikipedia
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Chalk - Wikipedia
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Chalk Original
Chalk: A biological limestone formed from shell debris
Chalk Definition | History
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Chalk: A biological limestone formed from shell debris
Blackboard Chalk Isn't Chalk
Chalk - Wikipedia
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The chalk and flint formation : its origin, in harmony with a very ancient and a scientific modern theory of the world, illustrated with facts and specimens. Chalk; Flint; Bible and
The Origin of Flint in Chalk
chalk - Wiktionary, the free dictionary
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Chalk | Sedimentary, Limestone, Calcium Carbonate | Britannica