Geochemistry

Ge′o‐chem″is‐try (jē′ō̍‐kĕm″ĭs‐try̆), n. [Gr. γέα, γη̑, the earth + chemistry.] The study of the chemical composition of, and of actual or possible chemical changes in, the crust of the earth. — Ge′o‐chem″ic‐al (#), a. — Ge′o‐chem″ist (#), n.