A sinkhole is a depression in grounds rich with easily dissolved rocks (such as limestone, carbonates, and salt beds) formed by solution or by collapse of a cavern roof.
Sinkholes result in karst topography over time. This is a landscape that is eroded by water interacting with limestone underground. It creates holes underneath the ground due to chemical reactions between water and limestone. This forms sinkholes. Over time, enough land is depressed to the point where there are very few points where the land is its original height.
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