sink holes in water

Sinkholes are cavities in the ground that form when water erodes an underlying rock layer. Two types of sinkholes exist. One forms when the roof of a cave collapses and exposes the underground... World's BIGGEST (and sometimes WEIRDEST) HOLES on Earth! (Including the biggest sinkhole on earth; the largest open pit mine in the world and the biggest mor... Sinkholes can be classified as geologic hazards sometimes causing extensive damage to structures and roads resulting in costly repairs. Sinkholes can also threaten water supplies by draining unfiltered water from streams, lakes and wetlands directly into the aquifer (underground water supply).

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