DID the oceans freeze 700 million years ago, turning the Earth into a huge
ball of ice? Controversy over the “Snowball Earth” theory is being stirred up by
new findings that suggest life went on as normal when the oceans were supposedly
covered with ice and almost lifeless.
Geochemist Martin Kennedy and sedimentologist Nicholas Christie-Blick studied
rocks from three continents and found no sign that life was affected at this
time. According to Christie-Blick, of the Lamont-Doherty Earth Observatory in
New York, their results prove that the oceans did not freeze over. “There was a
lot of sea ice,” he…
