![File:Subsurface erosion of soil into karst conduit by water level fluctuation.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Subsurface_erosion_of_soil_into_karst_conduit_by_water_level_fluctuation.jpg/446px-Subsurface_erosion_of_soil_into_karst_conduit_by_water_level_fluctuation.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:45, 3 May 2019 | ![]() | 2,231 × 3,000 (2.83 MB) | RockDoc485 | Illustrates how the fluctuation of the water table above and below the soil/rock surface develops sinkholes. Figure 18 of Newton, John G. "Development of sinkholes resulting from man's activities in the eastern United States". US Geological Survey, 1987, CIRCULAR 968 on pages 22 and 23. Available at https://pubs.usgs.gov/circ/1987/0968/report.pdf |
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