Final answer:
Sinkholes are common geological formations resulting from the dissolution of limestone. They can form either from below or at the surface, with collapse sinkholes being particularly hazardous due to sudden collapses of the ground.
Explanation:
Sinkholes are common features in areas underlain by limestone. They can form from beneath the surface or from the surface down. Collapse sinkholes occur when limestone is dissolved from below, weakening the support for the surface, leading to its collapse. Sinkholes can also form when water infiltrates the surface, widening fissures into which it flows, known as dolines.
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