BBC News - Yellowstone supervolcano 'even more colossal'
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A study shows that the magma chamber is about 2.5 times bigger than earlier estimates suggested.
A team found the cavern stretches for more than 90km (55 miles) and contains 200-600 cubic km of molten rock.
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The last major eruption, which occurred 640,000 years ago, sent ash across the whole of North America, affecting the planet’s climate.
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Scary and fascinating. This super volcano
will erupt at some point, the question is when. When it does the world is in for a lot of problems, the US might be a wasteland in most parts. There's nothing we can do to stop it or reduce the damage. Life is fragile, enjoy it.