A lava tube trace (dark sinuous shape) along the ground surface.
By Volcano Hazards Program
2012 (approx.)
![Aerial view of lava tube across landscape](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/lava%20tube.jpg?itok=6ML5h5o0)
Detailed Description
Aerial view of a lava tube trace (dark sinuous shape) along the ground surface at Medicine Lake Volcano, California.
Sources/Usage
Public Domain.