Karst, Karst holes, sinkholes

Dissolution (leaching) of certain rocks causes a number of phenomena which are called karst or, in a word, karst. They occur where the common soluble rocks: rock salt, gypsum, chalk, limestone, dolomite. Surface water and groundwater leached into them large and small cavities, often having bizarre shapes, forming caves, sinkholes, caves. When collapsing the roof above karst voids or leached rocks that lies from the surface, there are distinctive landforms - karst.

Of these, the most common craters of various sizes and shapes, hollows and dips; Carr — depressions, ditches, slit, furrow, cutting the earth's surface.

Under the influence of the karst there is a lot of amazing phenomena: lost (literally falls under the ground) rivers, streams, lakes; some rivers suddenly "emerges" on the surface, on the seabed of hollows poured out of fresh water. Guess some legends about suddenly disappearing cities were created under the influence of karst failures that have hit buildings.

Blue hole (eng. blue hole) — an underwater cave or a deep vertical groove. The term blue hole is a common name for sinkholes filled with water and located below sea level. It got its name because of the impressive contrast of deep dark blue water and the lighter water around.

By themselves, these funnels can also be taken as a mystical phenomenon called the devil's funnel or the gate of hell.

Translated by «Yandex.Translator»