wnyc.org / 93.9fm / am 820

Comments

• [1] Tejas Ranade from New Jersey August 03, 2007 - 01:46PM

  Please provide additional links and list of books that are relevant to this topic - particularly on the origins of life in the oceans.

  
  
• [2] PROFESSOR BAHADUR TEJANI from 191 WALLACE STREET,FREEPORT,NY,11520 August 03, 2007 - 02:36PM

  Leonard: What a marvelously complicated discussion. Please bring the scientists back. If I had Pulitzer I would give it to you.

  I would like you to raise this question. Why is it that the oldest continent in the world, Africa, does not have The African Ocean?

  with thanks, Professor Tejani

  
  
• [3] Chadwick Holmes from Lamont-Doherty Earth Observatory August 04, 2007 - 11:24AM

  Dr. Paul Falkowski's statement that the oldest rocks on earth are from the Isua Formation in Greenland (3.7-3.8 billion years old) is incorrect. The oldest rocks are actually the 4 billion year old Acasta Gneisses (where gneiss is pronounced like "nice") in Canada. In addition, single grains of the mineral zircon have been found in Western Australia that are about 4.4 billion years old! What makes this particularly interesting is these zircons have an oxygen isotope signature that suggests there was water (i.e. the ocean) on the surface of the earth 4.4 billion years ago. As a point of reference, the Earth itself is believed to be 4.5-4.6 billion years old.