Each topic has it's own page that includes the database comparison chart and recommendations for searching that topic ...
The science or study of the chemistry of the earth ...the origin of chemical elements, their evolution, the classes and many divisions of minerals and rocks and how they are created and changed by earth processes, and the circulation of chemical elements through all parts of the earth including the atmosphere and biological forms.
"Geochemistry." The Gale Encyclopedia of Science.
Ed. K. Lee Lerner and Brenda Wilmoth Lerner.
3rd ed. Vol. 3. Detroit: Gale, 2004. 1788-1790.
Gale Virtual Reference Library. Web. 10 Feb. 2014.