(via johnnychallenge, lavis)
Reblogged from johnnychallenge.
(via johnnychallenge, lavis)
blackkitesociety,
johnnychallenge,
johnnychallenge,
//water.usgs.gov/ogw/pubs/fs00165/SubsidenceFS.v7.PDF Figure 8. Collapse sinkholes, such as this one in Winter Park,...