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* 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'''.