Why do sinkholes suddenly appear in some landscapes?
Quick Answer
Sinkholes often form where soluble rock like limestone dissolves underground and the surface collapses into the cavity. They are most common in karst terrain.
The Full Story
Rainwater, slightly acidic from dissolved carbon dioxide, slowly dissolves carbonate rocks such as limestone and dolomite. Over time, underground cavities can expand until the roof can no longer support the ground above. The result may be a sudden collapse or a gradual settling depression at the surface. Sinkholes are especially common in regions with thick limestone, changing groundwater levels, or heavy pumping of groundwater.
Key Facts
YouTube Angle
Suggested video title for this topic:
"The ground can vanish when water eats away the rock beneath your feet."
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