bio

Soil aggregate

A cluster of sand, silt, and clay particles bound into a porous structure by roots, fungal threads, microbial glues, and organic matter. Spaces around and within an aggregate hold water, conduct gases, and create contrasting habitats millimetres apart: an oxygen-rich surface can surround an anoxic core. That architecture is why soil is not merely powdered rock mixed with dead leaves but a built living environment.