Αποτελέσματα Αναζήτησης
Earth’s original atmosphere was rich in methane, ammonia, water vapour, and the noble gas neon, but it lacked free oxygen. It is likely that hundreds of millions of years separated the first biological production of oxygen by unicellular organisms and its eventual accumulation in the atmosphere.
2 ημέρες πριν · The findings, which appear in the current issue of Nature, are the first direct evidence of what the ancient atmosphere of the planet was like soon after its formation and directly challenge years of research on the type of atmosphere out of which life arose on the planet.
11 Σεπ 2024 · Young Earth: Volcanoes released gases H 2 O (water) as steam, carbon dixoide (CO 2), and ammonia (NH 3). Carbon dioxide dissolved in seawater. Simple bacteria thrived on sunlight and CO 2. By-product is oxygen (O 2). Earth’s “second atmosphere” came from Earth itself.
When Earth formed 4.6 billion years ago from a hot mix of gases and solids, it had almost no atmosphere. The surface was molten. As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today’s atmosphere.
6 Ιουλ 2019 · Oxygen is actually the second most abundant element in the Earth, right after iron. While most of the oxygen was in rocks, some oxygen atoms formed water molecules (H2O) and carbon dioxide (CO2). These molecules came out of volcanoes as gases and formed the ocean and the atmosphere.
10 Μαΐ 2018 · As discussed above, the earliest atmospheric evolution of larger terrestrial planets is strongly connected to the protoplanetary nebular and the lifetime of the gas disk. This is directly related to the way how nonradiogenic Ne, Ar, Kr, and Xe isotopes, and other volatile elements (i.e. K, Na, etc.) have been fractionated.
After loss of the hydrogen, helium and other hydrogen-containing gases from early Earth due to the Sun's radiation, primitive Earth was devoid of an atmosphere. The first atmosphere was formed by outgassing of gases trapped in the interior of the early Earth, which still goes on today in volcanoes.
