Close-up of a skylight on coastal plain, Hawai`i Volcanoes National Park, with lava stalactites forming on the roof of the <a href="https://en.wikipedia.org/wiki/lava_tube" class="extiw" title="w:lava tube">w: lava tube</a>.
Hawaiian Volcano Observatory, U.S. Geological Survey
2008-03-28
<a rel="nofollow" class="external free" href="https://hvo.wr.usgs.gov/kilauea/update/archive/2008/2008_Mar.html">http://hvo.wr.usgs.gov/kilauea/update/archive/2008/2008_Mar.html</a>