A telephoto view of the channelized breakout source on PÅ«lama Pali. While the fluid lava rushes downslope, gas escapes through bubbles at the surface (seen near the breakout point). As the lava cools, it forms a crust which develops over the channel starting along the edges. If the breakout persists, it could completely crust over to form a lava tube. Photo taken Wednesday, November 22, 2017 courtesy of USGS/HVO