ADVERTISEMENT

Impact from the Deep: Overview/Mass Extinctions

  • More than half of all life on the earth has been wiped out, repeatedly, in mass extinctions over the past 500 million years.
  • One such disaster, which included the dinosaurs' disappearance, is widely attributed to an asteroid impact, but others remain inadequately explained.
  • New fossil and geochemical evidence points to a shocking environmental mechanism for the largest of the ancient mass extinctions and possibly several more: an oxygen-depleted ocean spewing poisonous gas as a result of global warming.
Share this Article:

Comments

You must sign in or register as a ScientificAmerican.com member to submit a comment.
Scientific American Holiday Sale

Black Friday/Cyber Monday Blow-Out Sale

Enter code:
HOLIDAY 2014
at checkout

Get 20% off now! >

X

Email this Article

X