Supervolcano
Like an asteroid impact, a gigantic supervolcano eruption could spread enough particles into the atmosphere which would block out the sun killing almost the whole plant life. The supervolcano is much more dangerous than any asteroid or comet said a NASA Engineer. NASA scientists are highly worried about the volcano which is beneath Yellowstone park and are testing many ways to prevent such an eruption.
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Like an asteroid impact, a gigantic supervolcano eruption could spread enough particles into the atmosphere which would block out the sun killing almost the whole plant life. The supervolcano is much more dangerous than any asteroid or comet said a NASA Engineer. NASA scientists are highly worried about the volcano which is beneath Yellowstone park and are testing many ways to prevent such an eruption.