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Photographer's Note

A small fishing boat goes past the base of one of the limestone pinnacles, one of thousands, in this strange karst geomorphological occurence, one of only a handful in the world. Thailand and southern China (Guilin) are other main areas like this. The jade green water and the calm weather typical of this are makes for a surreal atmosphere indeed.

Karst landforms are generally the result of mildly acidic water acting on soluble bedrock such as limestone or dolostone. The carbonic acid that causes these features is formed as rain passes through the atmosphere picking up CO2, which dissolves in the water. Once the rain reaches the ground, it may pass through soil that may provide further CO2 to form a weak carbonic acid solution: H2O + CO2 → H2CO3. Recent studies of sulfates in karst waters suggests sulfuric and hydrosulfuric acids may also play an important role in karst formation.

This mildly acidic water begins to dissolve the surface and any fractures or bedding planes in the limestone bedrock. Over time these fractures enlarge as the bedrock continues to dissolve. Openings in the rock increase in size, and an underground drainage system begins to develop, allowing more water to pass through and accelerating the formation of underground karst features.
Note from Wikipedia.

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Additional Photos by Murray Lines (MLINES) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2255 W: 203 N: 2719] (12516)
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