National Geographic's Guide To The Yellowstone Supervolcano

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Amid a growing 'swarm' of over earthquakes (now over 1000), and Montana's largest quake ever, scientists are growing increasingly concerned that the so-called 'super-volcano' at the heart of Yellowstone National Park could be building towards a Category 7 eruption. So what is a 'super-volcano' and what does its explosion mean for life on earth? NatGeo explains...

Think of Yellowstone as a gigantic pressure cooker, fueled by a massive supervolcano. Water from rain and snowmelt, much of it centuries-old, percolates through cracks in the Earth’s crust until heated by molten rock reservoirs deep below. The water then filters upward, eventually finding release in the thousands of geysers, hot springs, and other hydrothermal wonders.

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