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Earth's early atmosphere consisted of accreted gases from the solar nebula, but the atmosphere changed significantly over time, affected by many factors such as volcanism, impact events, weathering and the evolution of life (particularly the photoautotrophs).
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.
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 scientists show that the atmosphere of Earth just 500 million years after its creation was not a methane-filled wasteland as previously proposed, but instead was much closer to the conditions of our current atmosphere.
The Earliest Atmosphere (4.6 billion years ago) 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.
The origin of Earth’s atmosphere is a profound question of comparative planetology. The basic alternatives are a primary atmosphere captured from the solar nebula or a secondary atmosphere degassed from condensed materials accreted by Earth.
27 Απρ 2021 · Scientists studying Earth’s early atmosphere have found that it was very similar to the atmosphere found on Venus today. (Image by Tobias Stierli/NCCR PlanetS.) A long time ago, as our solar system was forming into the planets we know today, Earth was essentially a giant ball of molten lava.
