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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.
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.
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. After about half a billion years, Earth’s surface cooled and solidified enough for water to collect on it.
15 Νοε 2023 · Atmospheric Formation (4.4 to 4 billion years ago): The Hadean Eon witnessed the gradual formation of Earth’s atmosphere through processes like volcanic outgassing. The early atmosphere likely consisted of water vapor, carbon dioxide, nitrogen, and other volatile compounds. Formation of Oceans (4.4 to 4 billion years ago):
The early atmosphere was mainly carbon dioxide and water vapour. Water vapour condensed to form the oceans. Photosynthesis caused the amount of carbon dioxide to decrease and oxygen to...
6 Ιουλ 2019 · When Earth first formed, we think it was a hot, slowly cooling ocean of magma. This magma crystallized into rocks which formed the Earth’s crust. The rocks under the crust formed what we call the mantle.
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.
