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2 ημέρες πριν · The findings rest on the widely held theory that Earth’s atmosphere was formed by gases released from volcanic activity on its surface. Today, as during the earliest days of the Earth, magma flowing from deep in the Earth contains dissolved gases.
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.
The thermosphere is the second-highest layer of Earth's atmosphere. It extends from the mesopause (which separates it from the mesosphere) at an altitude of about 80 km (50 mi; 260,000 ft) up to the thermopause at an altitude range of 500–1000 km (310–620 mi; 1,600,000–3,300,000 ft).
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 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.
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.
Definition. The Earth atmosphere is a thin gaseous layer made of oxygen, nitrogen, and trace gases. It permits a mild temperature and provides a protection against cosmic rays, solar wind, and meteorite falls. It was stable enough through geological time to have nurtured the development of life.
