You're probably aware of the huge volcano lurking just below Yellowstone National Park. Well, a recent study has shown that during the past several years the volcano "has been rising at an unprecedented rate."
Volcanologists, however, aren't saying anyone should change their vacation plans just yet. Eruptions are usually preceded by warning signs, like more frequent earthquakes, changes in gas emissions, and an increase in escaping steam and heat. You may recall that in 1980 Mt. St. Helens had been acting up for about two months before erupting.
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