Honeycomb weathering is a type of salt weathering common on coastal and semi-arid granites, sandstones and limestones. Honeycomb weathering is not limited to natural settings and can be seen to develop on buildings where a rate of development can be established. This rate can be as fast as several centimeters in 100 years.
For honeycomb weathering to occur, a source of salt is needed because the basic mechanism for this kind of weathering is salt heaving. Salt is deposited on the surface of the rock by saltwater spray or by wind. Moisture must be present to allow for the salt to settle on the rocks so that as the salt solution evaporates the salt beings to crystallize within the pore-spaces of the rock, resulted in honeycomb deep holes.
Traces of honeycomb weathering could be found in many coastal sites in Hong Kong. One of the most famous called Human Head Rock is located in southern Cheung Chau. You can find an easy walking trail starting from Kwun Yam Beach lead you to the GZ.
Ref: 101 Geographical Landmarks (2010 edition)
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1) Take a picture with your GPS at an angle of showing the human face behind. (Optional)
2) Email the owner on estimating the diameter of the largest pits on Human Head surface.
3) Email the owner to answer which direction the honeycomb weathering is exposing to and the relation to the seasonal weather of Hong Kong.
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