Karst is a special type of landscape that is formed
by the dissolution of soluble rocks, including limestone
and dolomite. Karst regions contain aquifers that are capable
of providing large supplies of water.
More than 25 percent of the world's population
either lives on or obtains its water from karst aquifers.
In the United States, 20 percent of the land surface is
karst and 40 percent of the groundwater used for drinking
comes from karst aquifers. Natural features of the landscape
such as caves and springs are typical of karst regions.
Karst landscapes are often spectacularly scenic areas. Examples
include the sinkhole plains and caves of central Kentucky,
the large crystal-clear springs of Florida, and the complex,
beautifully decorated caves of New Mexico.
Common geological characteristics of karst regions
that influence human use of its land and water resources
include ground subsidence, sinkhole collapse, groundwater
contamination, and unpredictable water supply.
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