Approximate composition of the air

This pie chart sample shows the approximate composition of the air. "The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation). The common name given to the atmospheric gases used in breathing and photosynthesis is air. By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. Although air content and atmospheric pressure vary at different layers, air suitable for the survival of terrestrial plants and terrestrial animals currently is only known to be found in Earth's troposphere and artificial atmospheres." [Atmosphere of Earth. Wikipedia] This pie chart sample was redesigned from the Wikimedia Commons file: Air composition pie chart.JPG. [commons.wikimedia.org/wiki/File:Air_composition_pie_chart.JPG] This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. [creativecommons.org/licenses/by-sa/3.0/deed.en] The pie chart example "Approximate composition of the air" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Basic Pie Charts solution of the Graphs and Charts area in ConceptDraw Solution Park.