I have no science. So can someone explain what is happening to the orange lava flow on the left when it hits 'ground level'? Why isn't it still orange, as for example in the second 'live from' photo shown by
farmerbarleymow in this post?
{hopefully not being boring]
Simple explanation of the colour change is that the lava is cooling from near yellow heat when first erupted to orange and then red ... and eventually, the black surface is still very hot, but is more or less solid.
The very liquid & fast moving lava produces a ropey surface (pahhoehoe) in lots of over-lapping thin layers but when it is more viscous it a blocky surface (ah-ah) - some of the lumpy appearance is the earliest lava erupted was blocky when it cooled. The low viscosity of this lava makes puddling - when a fresh supply discharges into a volume, but under a crusted surface, this means convection from the hotter, new lava will break the surface.
Lava puddles quick to form | RÚV (ruv.is) [a miniature lava lake]
The vents are surrounded by splatter cones - the ejected lava is still almost liquid when it splashes back down and this sticks together.
There is some film of the first large cone, which shows this. The result is the almost vertical wall around the vent, which is what has partially collapsed a few times. The more energetic blobs go further and contribute to the cone shape. If one of these blobs is small enough and thrown sufficiently high / far then the surface can "set" during flight - these are "bombs" and they usually break apart on landing, unless the crust is quite thick. [best seen in low light conditions of early evening]
Both the main vents are discharging lava flows from fissures in flanks of their cones. The left hand one has been fairly fixed in location and output, in contrast the right hand vent discharge has relocated several times and is less productive.
[sorry, I'm a bit of a volcano nerd at times ...]