Cave-in section of roof of a lava tube. This is why walking on open lava fields
can be quite dangerous.
Image ID: corp2719, NOAA At The Ends of the Earth Collection
Location: Mauna Loa, Hawaii
Photo Date: 1982 February
Photographer: Commander John Bortniak, NOAA Corps (ret.)
Category: Observatory/Mauna Loa/Clean Air Facility/
• High Resolution Photo Available