OBSIDIAN LAVA: STILL FLOWING AFTER A YEAR!

An explosive volcanic eruption in Chile has given scientists the first direct insight into the strange motion of rocky lava known as obsidian flow.

Initially, the lava advanced several metres per day, then as its thick rocky crust cooled, it slowed. But, according to Dr Tuffen's data, over a year after the eruption, the lava was still advancing at a rate of 1.5m to 3m per day.

http://www.bbc.co.uk/news/science-environment-24821494
http://www.livescience.com/26919-obsidian-lava-chile-volcano.html