Photoglossary

Skylight

A skylight is an opening in the roof of a lava tube. Skylights usually form when part of the roof collapses into the tube, but they also occur where a roof failed to form over the lava channel. If the tube is active, a stream of glowing lava can be seen moving below.

Skylight on Kilauea's East Rift Zone, Hawaii. Photo: J. Alean

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