The composition of the atmosphere has changed over time, and is changing right now.īecause of human activities like farming and industry, we’re putting carbon dioxide back into the atmosphere more quickly than ever before. Mars atmosphere however is 95 carbon dioxide, 3 nitrogen, 1.6 argon, and it has traces of oxygen, carbon monoxide, water, methane, and other gases, along. That leaves approximately 1%, which is made up of atoms of unreactive argon, and molecules of carbon dioxide.Ĭarbon dioxide is a product of respiration, but it’s also taken in by plants for photosynthesis.Īnd in fact, before plants appeared on Earth, scientists think there was much more carbon dioxide but no oxygen in the early atmosphere.
Air also contains a significant amount of human-made air pollutants, including some that are not safe to breathe and some that warm our planet’s climate. Air is a mixture of gases, most of which are naturally occurring. It’s made up of a mixture of different gases.Ībout 78% of the atmosphere is nitrogen gas, N2, which is unreactive and just sort of hangs around.Ībout 21% is oxygen, O2, and that’s the stuff we need to breathe in. Three-fourths of all air resides in the troposphere, the lowest layer of the Earth’s atmosphere. Different types of gases present in air and their percentages: Nitrogen 78. Our planet is surrounded by an invisible shell of air, called the atmosphere, held in place by the Earth’s gravitational field. Composition of air is: Nitrogen - 78 Oxygen - 21 Carbon dioxide - 0.03 Inert gases - 0.9 Composition of dust, water vapour and impurities is different in different parts of the world, depending upon the factors affecting the air like industrial activities, natural resources, etc.
The air - it’s not something we think about much, but we wouldn’t last very long without it!
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