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 · For decades, scientists believed that the atmosphere of early Earth was highly reduced, meaning that oxygen was greatly limited. Such oxygen-poor conditions would have resulted in an atmosphere filled with noxious methane, carbon monoxide, hydrogen sulfide, and ammonia.
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.
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.
The secondary origin of Earth’s atmosphere led many to argue that the primordial atmosphere had the rather oxidized composition of volcanic gases (Poole 1951; Holland 1962; Abelson 1966). In modern volcanic gases the source is usually hot (∼1500 K) and only weakly reduced because the mantle is metal-free and the redox state is set by the ...
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 first atmosphere was formed by outgassing of gases trapped in the interior of the early Earth, which still goes on today in volcanoes. For the Early Earth, extreme volcanism occurred during differentiation, when massive heating and fluid-like motion in the mantle occurred.
