Here's why:
* Solubility: Limestone and dolomite are soluble in acidic water. Rainwater, which naturally absorbs carbon dioxide from the atmosphere, becomes slightly acidic. This acidic water dissolves the carbonate bedrock, creating cavities and underground spaces.
* Porosity: Carbonate rocks often have a high porosity, meaning they have many interconnected spaces and cracks. This allows for the movement of water, further dissolving the rock and enlarging existing cavities.
* Collapse: When the underground cavities become large enough, the overlying soil and rock can no longer support its weight and collapses, creating a sinkhole.
While sinkholes are most common in regions with carbonate bedrock, they can also occur in other types of rock, such as gypsum or salt deposits, which are also soluble. However, the prevalence and severity of sinkhole formation are significantly higher in areas with limestone or dolomite bedrock.
