| http://www.w3.org/ns/prov#value | - ??? ??? ??? A horizon The top layer of soil that has most nutrients and humus, most fully evolved layer dark in color and has minerals grains, decaying leaves, roots, insects, and worms. ??? ??? ??? B Horizon The layer of soil that is often called subsoil that usually consists of clay and other particles. ??? ??? ??? Bedrock The continuous mass of solid rock that makes up Earth's crust. ??? ??? ??
|
