A father-and-son team, consisting of a physicist and a geologist, revealed that their examination of deposition rates in sedimentary formations found high levels of a heavy metal, iridium, in the geological layer marking the end of the Cretaceous period. The evidence surrounding their findings is known as the "__________ hypothesis."

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      Alvarez
      Raup
      Simpson
      Stanley
asked Apr 11, 2013 in Social Studies by anonymous
    

1 Answer

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Alvarez
answered Apr 13, 2013 by CoolCat ~Expert~ (2,305 points)

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