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May 3, 2024 · Air, mixture of gases comprising the Earth’s atmosphere. The mixture contains a group of gases of nearly constant concentrations and a group with concentrations that are variable in both space and time. The atmospheric gases of steady concentration (and their proportions in percentage by volume)
- The Editors of Encyclopaedia Britannica
Oct 19, 2023 · ARTICLE. Air is the invisible mixture of gases that surrounds Earth. Air contains important substances, such as oxygen and nitrogen, that most species need to survive. Grades. 5 - 8. Subjects. Earth Science, Meteorology, Physics. Photograph. Parachuting through the Air.
The meaning of AIR is the mixture of invisible odorless tasteless gases (such as nitrogen and oxygen) that surrounds the earth; also : the equivalent mix of gases on another celestial object (such as a planet). How to use air in a sentence. Synonym Discussion of Air.
AIR meaning: 1. the mixture of gases that surrounds the earth and that we breathe: 2. the space above the…. Learn more.
- Original Atmosphere
- Second Atmosphere
- Third Atmosphere
At first it was mainly a hydrogen atmosphere. It has changed dramatically on several occasions—for example, the Great Oxygenation Event 2.4 billion years ago, greatly increased oxygen in the atmosphere from practically no oxygen to levels closer to present day. Humans have also contributed to significant changes in atmospheric composition through a...
Out gassing from volcanism, supplemented by gases produced during the late heavy bombardment of Earth by huge asteroids, produced the next atmosphere, consisting largely of nitrogen plus carbon dioxide and inert gases.
The constant re-arrangement of continents by plate tectonics influences the long-term evolution of the atmosphere. Carbon dioxide was transferred to and from large continental carbonate stores. Free oxygen did not exist in the atmosphere until about 2.4 billion years ago. The Great Oxygenation Event is shown by the end of the banded iron formations...
Apr 5, 2023 · AIR | Official Trailer. Amazon MGM Studios. 1.2M subscribers. 43K. 14M views 1 year ago #AIRMovie. From director Ben Affleck comes AIR. Exclusively in theaters April 5, 2023. #AIRMovie Follow...
- 2 min
- 14.3M
- Amazon MGM Studios
noun. a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere. a stir in the atmosphere; a light breeze. overhead space; sky: The planes filled the air. circulation; publication; publicity: to give air to one's theories. the general character or complexion of anything; appearance:
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