Why are sinkholes most common in locations where limestone makes up the bedrock?

A. Limestone is formed by the gradual precipitation of calcium calcite and other minerals from groundwater.

B. Limestone is created by groundwater dissolving rock underground.

C. Limestone is topography where the effects of groundwater erosion can be seen above ground.

D. Limestone is composed of calcium carbonate, which dissolves easily in acidified groundwater.

Sinkholes are prevalent in limestone regions due to the solubility of limestone in acidic groundwater, which creates large cavities. As these cavities grow, they can lead to collapses that form sinkholes. This process is typical of karst topography, especially in humid areas.

Explanation:

Understanding Sinkholes in Limestone Regions

Sinkholes are most commonly found in areas where limestone makes up the bedrock due to the solubility of limestone in slightly acidic water. Limestone, which is primarily composed of calcium carbonate (CaCO3), can dissolve when it comes into contact with natural groundwater that contains carbon dioxide. This process leads to the gradual formation of caverns and cavities underground.

As these cavities enlarge over time, they can eventually become unstable. When the support of the ground above is compromised, the surface can collapse, resulting in a sinkhole. This phenomenon is particularly prevalent in humid environments where groundwater is more likely to be acidic, facilitating limestone erosion and the formation of karst topography.

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