2. Referring to chemical reactions involving earth materials; such as, soil, rocks, and water.
3. The chemistry of the composition and alterations of the solid matter of the earth or a celestial body.
The study of the chemistry of the earth includes the study of the rocks and sediments that constitute the solid earth; as well as, the fluids of the oceans, inland waters, and atmosphere.
Geochemistry is based on a foundation of other sciences, including chemistry, geology, physics, and biology. This field of research includes the study of the movement, or flux, of chemical elements through the solids and fluids of the earth.