NOVA

Volcanic Rock Helps Predict Speed of Future Lava Flow

Clip: Season 45 Episode 10 | 1m 33s

Silica is a key component of sand but also of lava. The less there is, the more fluid the lava, and the faster it flows. Nyiragongo has some of the lowest-silica-content-lava on the planet, but there’s another clue to the lava’s speed—and it’s not good news.

Aired: 09/19/18

Rating: NR

Video has closed captioning.

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