This document is only available to subscribers
O horizon
The organic horizon of a mineral soil - usually found at the surface.
Further information
isurv environment
O2
Oxygen (the normal bivalent form).
Further information
isurv environment
O3
Ozone. A trivalent form of oxygen. It is a strong oxidising agent and highly reactive. Atmospheric ozone is mainly derived from the action of sunlight on nitrogen dioxide....
