Is chalk a rock? - Quora
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Monument Rocks, Kansas | Cretaceous Chalk Cliffs in the Middle of the Prairie » Bonjour Becky
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Geological Society - Chalk cliffs, Sussex
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Limestone and chalk - YouTube
Limestone is a type of sedimentary rock that is mainly made up of a substance called calcium carbonate. Calcium carbonate has the chemical formula, CaCO. - ppt download
Chalk
What's the difference between chalk and charcoal? - Quora
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Chalk | Properties, Composition, Formation and Uses
How chalk is made - material, making, used, processing, procedure, product, industry
Chalk | Sedimentary, Limestone, Calcium Carbonate | Britannica
DISCOVERING FOSSILS | What is chalk and how does it form?
Chalk Rock Type, Composition, Formation, Occurrence & Uses
