- found: McGraw Hill dict. of sci. and tech. terms, c2003 (soil chemistry [GEOCHEM] The study and analysis of the inorganic and organic components and the life cycles within soils; geochemistry [GEOL] The study of the chemical composition of the various phases of the earth and the physical and chemical processes which have produced the observed distribution of the elements and nuclides in these phases)
- found: Wikipedia, Aug. 19, 2011 (The field of geochemistry involves study of the chemical composition of the Earth and other planets, chemical processes and reactions that govern the composition of rocks, water, and soils, and the cycles of matter and energy that transport the Earth's chemical components in time and space, and their interaction with the hydrosphere and the atmosphere.)
- 1986-02-11: new
- 2011-11-15: revised
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