What are sinkholes? Want answers?
see the recent post from the USGS about sinkholes at:
http://www.usgs.gov/blogs/features/usgs_top_story/the-science-of-sinkholes/?from=title
For the College of Engineering at the University of Notre Dame, South Bend, Indiana.
see the recent post from the USGS about sinkholes at:
http://www.usgs.gov/blogs/features/usgs_top_story/the-science-of-sinkholes/?from=title
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2:03 PM
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