An explosive volcanic eruption in Chile has given scientists the first direct insight into the strange motion of rocky lava known as obsidian flow. Rather than a red river of molten rock oozing down a mountainside, this lava is a thick, rubble-strewn mass of rock. via Pocket http://www.bbc.co.uk/news/science-environment-24821494#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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