top-soil

The upper, outermost layer of soil, usually the top 2 inches (5.1 cm) to 8 inches (20 cm). It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs.

Synonym: 
topsoil
Citation: 
https://en.wikipedia.org/wiki/Topsoil
English

There is currently no content classified with this term.