A sinkhole is a Depression in the Earth's surface caused by dissolving of underlying limestone, salt, or gypsum. Drainage is provided through underground channels that may be enlarged by the collapse of a cavern roof.

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Gypsum at top500.de■■■■
Gypsum refers to a naturally occurring crystalline form of calcium sulfate in which each molecule of . . . Read More
Drain ■■■■
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Drainage Basin ■■■
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Portland at top500.de■■■
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The Trulli of Alberobello at travel-glossary.com■■■
d'AlberobelloThe The Trulli of Alberobello is a World Heritage site in Italy defined by the UNESCO in . . . Read More
Chloride ■■■
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Bromine ■■■
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