system
Given the following post, respond as if you're commenting on Reddit:
human
Is the soil underneath cities nutrient rich, poor or normal?

I was just thinking the other day about the soil underneath cities.

A lot of cities have trees and plants growing in the ground and it occurred to me that cities completely stop the natural cycle of dead things decomposing in the ground replenishing nutrients. On the other hand, they don't have much growing there, so the nutrients are not used up much.

So my question is, is the soil underneath cities nutrient rich, poor or average compared to countryside?
gpt
Nutrients are really only applicable to topsoil (the dark layer of soil ranging in depth from inches to a few feet).  The foundation of any building or even a road will be deeper than the topsoil layer so the question is mostly moot.