What is karst?

a kind of physical decomposition
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a kind of chemical decomposition
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a kind of biological decomposition
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none of the above
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Karst is a topography formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum. It is characterized by underground drainage systems with sinkholes and caves. It has also been documented for more weathering-resistant rocks, such as quartzite, given the right conditions.
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