How much of the Nation is susceptible to sinkholes (i.e., underlain by rock that dissolves easily)?
- 100%
- 55%
- 20%
- 5%
To see the answer, scroll down below the image.
The correct answer is 20%. About 20% of the Nation is underlain by karst, which is characterized by terrain where the underlying rock can be dissolved by groundwater and is consequently vulnerable to the earth collapsing. Sinkholes are common in these areas and can be as sudden as they are devastating. Individuals can check if they live in areas underlain by soluble rock through county offices, local or state geological surveys, or USGS maps.
"Hazard a Guess?" is an ongoing series, so check out past questions and come back soon for more. Don't forget to share these with friends and family to help raise awareness of natural hazards.
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