New hornitos formed
Detailed Description
New hornitos formed near site of former Cookie Monster skylight on top of upper Mother's Day lava tube. Hornitos grow as small quantities of lava are pushed up inside hollow hornito by rising gas. When lava reaches rim of hornito, gas boosts it upward above the rim, where the lava quenches within seconds in the relatively cool air. Hornitos thus grow incrementally whenever lava glob reaches rim.
Sources/Usage
Public Domain.