[jee-oh-kem-uh-stree] 
| the science dealing with the chemical changes in and the composition of the earth's crust. |
| ge·o·chem·is·try (jē'ō-kěm'ĭ-strē) n. The chemistry of the composition and alterations of the solid matter of the earth or a celestial body. ge'o·chem'i·cal (-ĭ-kəl) adj., ge'o·chem'i·cal·ly adv., ge'o·chem'ist n. |
| geochemistry (jē'ō-kěm'ĭ-strē) Pronunciation Key
The scientific study of the chemical composition of the Earth or other celestial body and of the reactions that control the distribution of chemical elements in its minerals, rocks, soil, waters, and atmosphere. |
oʊˈkɛm