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Close up of chalk rock showing bedding planes, joints, faults, biotic weathering by tree roots, Wiltshire, England, UK Stock Photo - Alamy
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File:Close-up of weathered chalk, Ashdown House, Lambourn - geograph.org.uk - 1874543.jpg - Wikimedia Commons
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Weather + Erosion Stations - What happens when chalk goes in water? What about in vinegar? This qui… | Weathering and erosion, Science experiments, Science lessons
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Easy and Effective Model Train Weathering | Simple Model Train Weathering with Chalk Powders - YouTube
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