Sinkholes

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Karst Topography
Karst topography is a landscape formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes, dolines, and caves.
Limestone
a hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement.
Carbonate Rock
Carbonate rocks are a class of sedimentary rocks composed primarily of carbonate minerals. The two major types are limestone, which is composed of calcite or aragonite (different crystal forms of CaCO3) and dolostone, which is composed of the mineral dolomite
Dissolve
with reference to a solid) become or cause to become incorporated into a liquid so as to form a solution.
Cave
a large underground chamber, typically of natural origin, in a hillside or cliff.
Collapse
(of a structure) fall down or in; give way.
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