Geochemistry (noun)

1. The branch of science that studies the chemical composition and processes of the Earth and its rocks, minerals, fluids, and gases.
2. The study of the chemical processes and substances that make up the earth and its rocks, minerals, fluids, and gases.

Origin:

From greek geōs ("earth") + chemistry.

Examples:

1. Geochemistry is the study of the chemical composition and processes of the Earth.
2. Geochemistry plays an important role in understanding the Earth's geologic history.
3. The geochemistry of the soil is important for agriculture.
4. The geochemistry of water is important for understanding the quality of water resources.
5. The geochemistry of the rocks and minerals helps to understand the processes that shaped the planet.