Organic matter.
Soil is found in fertile ground
alfalfa
The most fertile soil is found around the Nile delta.
I think this is the answer: Some soil organisms mix the soil and make spaces in it for air and water. Other soil organisms make humus, The material that makes soil fertile.
The soil is good for farming because it is fertile
fertile soil is found here.
Ukraine
ash and lava
Savannah biome has a fertile soil, it has an enriched nutrients.
yes because as we mine, the top soil is washed away and this makes the soil in-fertile.
It is not found everywhere
It is not found everywhere