<https://strangesounds.org/category/weather-anomalies/earth-changes-2/geology/sinkhole-2>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://strangesounds.org/2013/01/a-sinkhole-destructs-and-swallows-buildings-in-china-january-28-2013.html>