300 million years of snow fell on the earth 2.4 billion years ago. The reason for the formation has caused scientists to worry:
Do you know? There was a period of cold winter on the earth that lasted for 3 billion years. The entire earth was covered by heavy snow. Even the hottest equator on the earth was covered by snow and ice. At that time, all the creatures on the earth died in the snow and ice. After that, it took 1.6 billion years for the earth to come back to life. So what happened during this time period? What caused this change?
< p>I believe you may sound incredible, but it really happened on the earth. This is what the earth is famous for Ice age. It should be understood that in the early days of the earth, the oxygen content in the atmosphere was very low. At that time, life on earth was not aerobic, but anaerobic. Because anaerobic organisms decompose proteins and other organic substances under anaerobic conditions, the energy released is very small, so the body of anaerobic organisms is very small, and its mode of existence is generally bacteria.
< p>It is precisely because of this that for a long time scientists have suspected that there may be other life forms on the earth. The reproduction of oxygen organisms is not in line with the current ecological environment of the earth, but there is often an exception, that is, a different kind of bacteria was born at that time, that is blue Bacteria. And the reason why there is so much oxygen on the earth now is most of its credit. Because of this, the oxygen on the earth gradually increased, and anaerobic organisms ushered in a period of mass extinction. Due to the multiplication of a large number of blue cells, many aerobic organisms appeared on the earth, and the oxygen content on the earth reached a maximum of 40%.
< p>The end result is that the amount of methane on the earth continues to decrease, and the huge performance is cooling. Coupled with the brightness of the sun, it was not as high as the heat output at that time 2.4 billion years ago, but only 20%to 25%of the current heat output, which caused the earth to be covered with snow and ice, and there was also a thick layer of ice on the equator at that time. Covering, even the earth was called a hockey puck at the time. This process lasted for 300 million years. Of course, some volcanoes resisted. After 300 million years of accumulation, the ice layer on the earth gradually melted, but at this time there is still no life on the earth. So how did life appear?
< p>The reason is actually very simple. After the primitive life on Earth died, these remains existed on the surface of the ocean, and some of them slowly sank The bottom of the ocean is not oxidized, and a dissolved organic carbon pool is slowly formed. re After 1 billion years of geological tectonic movement, this organic carbon pool slowly entered the surface and formed a rapid oxidation event, and various organisms appeared on the earth. And this seems to be a cycle, so some scientists have come to the statement that”life on earth repeats itself again and again.”
< p>But some scientists believe that if the earth’s environment continues to deteriorate, then the earth is likely to repeat the same mistakes and become an ice ball. At that time, the creatures on the earth will be destroyed again. Perhaps the wandering earth is not just a movie that will become reality. Of course, it is also possible that after the creatures on the earth are extinct again, new life will evolve and form a new civilization. .