The feature pictured below is formed as a result of subsurface dissolution of limestone rock which can weaken the overlying material and cause it to collapse. These resulting features are called: 
Definitions:
Contaminated Water
Water that has been polluted with harmful substances, making it unsafe for consumption and use, posing health risks.
Mental Health Issues
Disorders that affect mood, thinking, and behavior, influencing one's emotional and psychological well-being.
Second-Hand Smoke
Tobacco smoke that fills environments when tobacco products are burned, affecting non-smokers by inhaling the smoke involuntarily.
Otitis Media
An infection or inflammation of the middle ear, which is common in children and can cause earache and fever.
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