the.com/biogeochemistry

means The study of how chemical elements cycle through living things, rocks, water, and air, and how each domain shapes the others over time.

from A straightforward 20th-century compound stitched together from Greek and Latin building blocks: 'bio-' (life, from Greek bios), 'geo-' (earth, from Greek gē), and 'chemistry' (from alchemy, ultimately tracing back through Arabic to a Greek word for the art of transmuting metals). Scientists needed a name for the emerging discipline that refused to treat life, rock, and air as separate filing cabinets — so they just welded the three names together, which is very on-brand for a field whose whole point is that nothing in nature respects your categories.