Ms. Namfon Khamphilang, an expert in the Department of Mineral Resources, said after the initial survey that the area is made of limestone, which can dissolve slightly acidic water. When the slightly acidic water flows down through the cracks underground and erodes the limestone below, it creates cavities supported by water. But when there is a change in the groundwater level, which may be caused by an earthquake, the groundwater system changes, causing subsidence, resulting in sinkholes.
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