![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/9/95/Runoff_of_soil_%2526_fertilizer.jpg/640px-Runoff_of_soil_%2526_fertilizer.jpg&w=640&q=50)
Topsoil
Top layer of soil / From Wikipedia, the free encyclopedia
Topsoil is the upper layer of soil. It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/9/95/Runoff_of_soil_%26_fertilizer.jpg/640px-Runoff_of_soil_%26_fertilizer.jpg)
Topsoil is the upper layer of soil. It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs.