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* '''[[:Category:Natural sciences|Natural sciences]]:''' العلوم الطبيعية * '''[[:Category:Earth sciences|Earth sciences]]:''' علوم الأرض

'''[[Earth science]]s'''<br/> [[Atmospheric sciences]]{{·}}[[Ecology]]<br/>

=== Natural sciences === {{Main|Natural science}} &nbsp; See also: [[#Social sciences|Social sciences, below]]''

* earth * earth alkaline

[[Image:Ozone-montage.png|thumb||left|upleft|100px|Ozone is a rare gas on Earth found mostly in the [[stratosphere]].]] [[Image:Oxygenation-atm.svg|thumb|right|255px|O₂ build-up in Earth's atmosphere: 1) no O₂ produced; 2) O₂ produced, but

...F) and vaporizes forming steam at 100°C (212°F). Water occurs naturally on earth as rivers, lakes, and oceans, and falls from the clouds as rain. Water’s * WSTB Water Sciences and Technology Board.

...ريمان و كومبني W. H. freeman & Company لسماحهم باستعمال شاهد من كتاب الأرض Earth للمؤلف ج. س. لويس J. S. Lewis لبرس وسايفر Press and S ...لف الكتاب الواسع الانتشار (الصلات ما بين العلوم) The Relations Between The Sciences الذي صدر عام 1968'''.

...why do we not find them embedded in countless numbers in the crust of the earth?" Darwin felt though that the "extreme imperfection" of the fossil record w ...Stasis - most species exhibit no directional change during their tenure on earth. They appear in the fossil record looking much the same as when they disapp