Now, new geoloical data has comfirmed that complex life came after a period of global cooling which lasted over three billion years. Evidence proves that the world's oceans were once steamy cauldrons which came from the distribution of the element silicon in ancient rocks known as cherts. François Robert and Marc Chaussidon report that cherts formed from ocean sediments provide a kind of "paleothermometer" for seas during the Precambrian era. The Precambrian era is the vast stretch of time between Earth's formation more than 4.5 billion years ago and the rise of multicellular organisms about 600 million years ago.
I think that its pretty cool how at first the oceans were like boiling water or like a cauldron. Its also cool because thats how I think there were many detailed creatures on the earth and I also think its amazing how it took 3 billion years to cool all the oceans or mabye in those days ocean.
The picture is a cross-section of a chert sample from China, dated at 1.4 billion years old, shows the structures of silica at a microscopic scale. A new study of the silicon found in chert determined that a period of global cooling chilled the oceans of ancient Earth from temperatures as high as 158 degrees Fahrenheit (70 degrees Celsius) 3.5 billion years ago to 68 degrees Fahrenheit (20 degrees Celsius) about 600 million years ago.
Source: http://www.news.nationalgeographic.com/
