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The Earth's '''atmosphere''' is the layer of [[gas]]es around the [[Earth]]. It is held in place by Earth's [[gravity]]. It is today made up mainly of [[nitrogen]] (78.1%). It also has plentiful [[oxygen]] (20.9%) and small amounts of [[argon]] (0.9%), [[carbon dioxide]] (~ 0.035%), [[water vapor]], and other gases. The atmosphere protects [[life]] on Earth by [[Absorption|absorbing]] (taking) [[ultraviolet]] rays from the [[Sun]]. It makes our [[day]]s cooler and our [[night]]s warmer.
The Earth's '''atmosphere''' is the layer of [[gas]]es around the [[Earth]]. It is held in place by Earth's [[gravity]]. It is today made up mainly of [[nitrogen]] (78.1%). It also has plentiful [[oxygen]] (20.9%) and small amounts of [[argon]] (0.9%), [[carbon dioxide]] (~ 0.035%), [[water vapor]], and other gases. The atmosphere protects [[life]] on Earth by [[Absorption|absorbing]] (taking) [[ultraviolet]] rays from the [[Sun]]. It makes our [[day]]s cooler and our [[night]]s warmer.
Solid [[particulate]]s, including [[ash]], [[dust]], [[volcanic ash]], etc. are small parts of atmosphere. They are important in making [[cloud]]s and [[fog]].
[[Solid]] [[particulate]]s, including [[ash]], [[dust]], [[volcanic ash]], etc. are small parts of atmosphere. They are important in making [[cloud]]s and [[fog]].
The atmosphere does not end at a specific place. The higher above the Earth, the thinner the atmosphere. There is no clear [[border]] between the atmosphere and [[outer space]], though the [[Kármán line]] is sometimes treated as a border. Even higher, for some purposes the edge of the [[magnetosphere]] is treated as a border. 75% of the atmosphere is within {{convert|11|km|abbr=off}} of the Earth's [[surface]].
The atmosphere does not end at a specific place. The higher above the Earth, the thinner the atmosphere. There is no clear [[border]] between the atmosphere and [[outer space]], though the [[Kármán line]] is sometimes treated as a border. Even higher, for some purposes the edge of the [[magnetosphere]] is treated as a border. 75% of the atmosphere is within {{convert|11|km|abbr=off}} of the Earth's [[surface]].