Biogeochemistry is a field that studies how living things and non-living things interact on Earth. It looks at how chemicals move between the ground and living organisms, like plants and animals. The Earth's geosphere and biosphere are important parts of this process. The geosphere is really old, about 4.54 billion years, and has changed a lot over time. The biosphere, where life exists, has been around for about 3.5 billion years. Human activities have started to impact these natural processes, causing changes to the Earth's ecosystem. The research in this field focuses on understanding these interactions and their effects on our planet.