40% of the U.S. Lies in Areas Prone to Sinkholes Posted by Earth_Change on Thursday September 06, 2018 @01:04PM from the strangesounds.org dept. http://strangesounds.org/2013/07/us-sinkhole-map-these-maps-show-that-around-40-of-the-u-s-lies-in-areas-prone-to-sinkholes.html ( no comments | on HN )
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