Yellowstone supervolcano even more vast
 

As tourists stroll between Yellowstone's 300 active geysers, taking selfies in front of thousands of bubbling, boiling mud pots and hissing steam vents, they are treading one of the planet's greatest time bombs.http://feeds.feedburner.com/~ff/rss/...?d=yIl2AUoC8zA</img> http://feeds.feedburner.com/~ff/rss/...?d=7Q72WNTAKBA</img> http://feeds.feedburner.com/~ff/rss/...do:V_sGLiPBpWU</img> http://feeds.feedburner.com/~ff/rss/...?d=qj6IDK7rITs</img> http://feeds.feedburner.com/~ff/rss/...do:gIN9vFwOqvQ</img>


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