Lava flow
Detailed Description
Sometime in the last week, a 2-3 m (yard) skylight opened over the recently formed lava tube that is currently feeding the ocean entry. The terrace on the edge of the lava stream hosts smooth ripple-like features that form during lava level fluctuations, when lava rises up and spills over onto the ledge. Flow direction is from right to left.
Sources/Usage
Public Domain.