Topsoil (noun)

The layer of soil that is rich in organic matter and is located at the surface of the ground.

Origin:

From the combination of "top" and "soil".

Examples:

1. The garden needs new topsoil before we can plant anything.
2. Topsoil is an essential component for healthy plant growth.
3. The construction of the new building removed most of the topsoil from the area.
4. The farmer spread fertilizer on the topsoil to improve crop yields.
5. The topsoil should be at least 6 inches deep for good root growth.