yellowstone volcano in northwestern Geophysical reports commented that the volcano has increased its activity at a record pace since 2004. Its floor has been inflating at a rate of three inches per year in the last three years, the fastest rate since records began in 1923.
The magma is now about 10 kilometers deep, so there is no need to worry about it now. But if it comes up to the level of two or three kilometers from the surface, then we have reason for concern, says Robert Smith, professor
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