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Geography fun facts and oddities: Difference between revisions

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== Geography oddities ==
== Geography oddities ==


=== Sink holes ===
=== Sinkholes ===
* sinkholes are holes or caves in the ground caused by erosion or a collapse of a lower, below-ground surface, usually because of water drainage
* sinkholes may also be caused by a drainage of water, such as a water table decline
* sinkholes are most common where limestone, sandstone, salt beds, or gypsum are prevalent
[[File:Thor's Well (37588682016).jpg|450px|border|right|thumb|Thor's Well: a sinkhole on the coast of Cape Perpetua, Oregon]]
[[File:Thor's Well (37588682016).jpg|450px|border|right|thumb|Thor's Well: a sinkhole on the coast of Cape Perpetua, Oregon]]
* Thor's Well: a sinkhole on the coast of Cape Perpetua, Oregon, that drains at high tides
* Thor's Well: a sinkhole on the coast of Cape Perpetua, Oregon, that drains at high tides
[[File:December_Giant_sinkhole_collapse_USGS_1972.jpg|400px|border||right|thumb|More than three acres of forest suddenly disappeared into this "December Giant" sinkhole in Montevallo, Alabama, USA.]]
* See
** [[https://en.wikipedia.org/wiki/Sinkhole Sinkhole (wiki)]]


=== Enclaves & Exclaves ===
=== Enclaves & Exclaves ===