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Puzzle of Aven d'Armand

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Aven d'Armand

An Aven is a sort of dome cave, created by rainwater from above. Acid rain slowly dissolves the chalk in the soil and erosion and collapsing structures do the rest. In the end an underground dome is created, often with just a very small opening in the top to the open air. The Aven Armand is one of the best known of France.
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