The Unmanned Aircraft Systems (UAS) team assessed conditions at the fissure
8 cone and upper lava channel
on August 17, 2018. At the time of the flight, the lava
pond within the cone had crusted over with no observed incandescence. The reddish-brown rock inside the cone is the result of oxidation; the interaction of heated rock and gases causes black basaltic
cinders to change color, similar to rust forming on metal.