The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 701
... Elements in Different Geochemical. dances for many of the less common elements ; these esti- mates were based in many instances on very ... element carbonaceous Moon chondrites Earth's ( Apollo Elements , Geochemical Distribution of 701.
... Elements in Different Geochemical. dances for many of the less common elements ; these esti- mates were based in many instances on very ... element carbonaceous Moon chondrites Earth's ( Apollo Elements , Geochemical Distribution of 701.
Page 712
... elements . Helium is a very rare element on Earth , so rare in fact that it was first discovered as an unidenti- fied line in the Sun's spectrum in 1868 , some 30 years be- fore it was detected on Earth . Hydrogen is moderately abundant ...
... elements . Helium is a very rare element on Earth , so rare in fact that it was first discovered as an unidenti- fied line in the Sun's spectrum in 1868 , some 30 years be- fore it was detected on Earth . Hydrogen is moderately abundant ...
Page 713
... elements in the surrounding water . Operating in conjunction with physical and chemical processes , biological processes may concentrate an ele- ment as much as 1,000,000 times ... Elements in Elements , Physiological Concentration of 713.
... elements in the surrounding water . Operating in conjunction with physical and chemical processes , biological processes may concentrate an ele- ment as much as 1,000,000 times ... Elements in Elements , Physiological Concentration of 713.
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activity Africa agriculture America became become body called capital caused central centre century changes Christian Church continued core countries cultural demand direction early Earth East Eastern eclipse economic effect established Europe example feet field Figure flow force groups growth important income increase industry internal investment Italy kilometres known labour Lake land later less living magnetic major mantle material means measurements ment metres miles mountains move movement nature North observed occur ocean organization origin Orthodox patriarch percent period planning Pleistocene political population position possible present problems production region relatively remained result rise River rocks social society South species structure surface theory tion trade traditional United West Western