Topsoil—The first true layer of soil; layer in which organic material is mixed with mineral particles; thickness ranges from a meter or more under virgin prairie to zero in some deserts.
CMP Bio WorldCMP Bio World: Your Online Biology Book
CMP Bio WorldTopsoil—The first true layer of soil; layer in which organic material is mixed with mineral particles; thickness ranges from a meter or more under virgin prairie to zero in some deserts.
CMP Bio World 