https://www.livescience.com/moon-balmy-zones
"Of the 200 pits discovered, two to three have overhangs that lead to a cave, while 16 appear to be "'skylights"' to collapsed lava tubes. On Earth <https://www.livescience.com/earth.html>, lava tubes are hollow caves found close to the surface in volcanic <https://www.livescience.com/27295-volcanoes.html> regions — most notably Kazumura Cave in Hawaii Volcanoes <https://www.livescience.com/27295-volcanoes.html> National Park and La Cueva del Viento on Tenerife in the Canary Islands."
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