IPA: //ˌbaɪoʊdʒiˈkɛmɪstri//
KK: /baɪoʊdʒiˈkɛmɪstri/
The study of how living organisms interact with the chemical elements in their environment, including soil, water, and air.
Biogeochemistry helps us understand how nutrients cycle through ecosystems.
Biogeochemistry is formed from "bio-" (from Greek "bios", meaning life), "geo-" (from Greek "geō", meaning earth), and "chemistry" (from Greek "khēmia", meaning the study of substances and their interactions). The word refers to the study of the chemical processes and substances that occur in living organisms and the earth.
Think of 'life' ('bio-') interacting with the 'earth' ('geo-') through 'chemical' processes — that's what biogeochemistry studies.