Weathering and Erosion

 

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Most of the island is covered with an uneven layer of weathered materials, which may be as thick as 30 metres in some cases. The mantle of weathered materials is thinner on the steeper slopes. The soil is subjected to removal by soil creep, rain wash and slumping. Thus, the ground surface is mostly covered by gravel and residual boulders, and in some places, there are gullies and small landslide scars.

The coastline of the island is long and very indented. Although the island is protected from fill force of the South China Sea by Lamma Island to the east and by Linting and other islands to the south, it is under the influence of the prevailing easterlies. The fetch is very long on the southern and eastern pans of the coast, which is subjected to wave erosion especially during the typhoon season.