Chalk - Wikipedia
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Geological Society - Chalk cliffs, Sussex
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Chalk - Wikipedia
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Chalk
Raw Limestone Chalk, Sedimentary Rock Specimen - Approx. 1" - Geologis — Eisco Labs
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Chalk, Cretaceous, Devon (rock sample) – Earthlines
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Macro Shooting Of Natural Mineral Rock Specimen - Rough Chalk Stone On White Marble Background Stock Photo, Picture and Royalty Free Image. Image 98664900.
Chalk: A biological limestone formed from shell debris
