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What would happen if all supervolcanos erupted all at once?

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Scientists say the chance of every volcano erupting at once is so small that it's impossible, but what if it did happen? ... But the list of 1,500 potential active volcanoes, compiled by the U.S. read more

For instance, the eruption of Mount Pinatubo in 1991 — one of the two largest eruptions in the 20th century — cooled parts of the world by up to 0.7 degrees Fahrenheit (0.4 degrees Celsius) for two years. read more

The Earth currently has 1,500 'active volcanoes' - meaning they have had at least one eruption during the past 10,000 years. This is aside from the continuous belt of volcanoes on the ocean floor, about 500 of which have erupted in historical time. However, not all eruptions are the same. read more

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