From killer asteroids to supervolcanoes, doomsday scenarios involving natural disasters have been the subject of speculation and concern for centuries - here is a list of the top five most significant natural disaster threats.
"In light of all the recent seismic activity and sub-sequent tsunami , we thought we would go back and give a look at what scientists think the top 5 natural disasters would be for the United States."
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Source: Armageddon Online
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