In addition to the leading theory of asteroid, meteoroid, or cometary impact, which of the following ideas has been seriously advanced to explain the Cretaceous-Tertiary mass-extinction event that wiped out most dinosaur species?

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     reversal of the Earths magnetic fieldd
      increased geological activity
      devastating plagues
      a nearby supernova explosion
      All of the ideas presented here have been proposed.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

0 votes
All of the ideas presented here have been proposed.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)



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