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Before life began on the planet, Earth's atmosphere was largely made up of nitrogen and carbon dioxide gases. After photosynthesizing organisms multiplied on Earth's surface and in the oceans, much of the carbon dioxide was replaced with oxygen. (more) Earth’s original atmosphere was rich in methane, ammonia, water vapour, and the noble gas ...
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 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).
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.
Secondary atmosphere. The atmosphere that developed after primordial gases had been lost or had failed to accumulate is termed secondary. Although the chemical composition of the atmosphere has changed significantly in the billions of years since its origin, the inventory of volatile elements on which it is based has not. Origin
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.
