To a geologist or an engineer, soil is not only a medium which is built upon but also a medium to be built with. Stones, bricks and sand are three but widely used components of a building obtained from earth’s crust. Although, built structures generally fall short of providing nutrients necessary for life to thrive. For instance, manufacturing process of brick requires clay to be burnt – volatilising elements like potassium, nitrogen and phosphorus critical to support lifeforms. Not surprisingly then, our understanding within ‘human-dominated systems’ has remained of soil that is built upon or “restricted to the surface horizons”. Collage by author: tiers of vegetation on built surfaces abov
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