ST Explains: What is a sinkhole and how is it formed?

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ST Explains: What is a sinkhole and how is it formed?
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A 48-year-old woman fell into an 8m deep sinkhole in Kuala Lumpur on the morning of Aug 23.

The Indian national was visiting Malaysia and walking in the Jalan Masjid India area in Kuala Lumpur when a section of the sidewalk suddenly caved in.

According to the British Geological Survey , this means these typically saucer-shaped hollows are caused by the collapse or removal of an underlying layer of rocks needed to support the surface layer of material. The sides of sinkholes can range from gentle slopes to almost vertical edges, and can be shaped like saucer-like hollows, cones, cylindrical potholes and shafts.The time taken for a sinkhole to form can vary dramatically.

These sinkholes typically occur in clay rocks and form in a similar fashion to their slow-growing counterparts, with loose, unconsolidated soil leaching into a cave underground.

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