Do you mean on top of the soil? A ferret play pen that is sold in stores, has the option of buying a cover that can be used either on top or the bottom.
A ferrets favorite activity is a dig box - a container filled with long grain rice (DO NOT USE instant rice). Other alternatives can be - potting soil, play sand, dried beans, ping pong balls, or pebbles can also be used to satisfy your ferrets digging behavoir.
It goes back into the soil.
Bedrock.
Permafrost is used for the continually frozen layer of soil underneath Earth's surface in high latitudes.
Water
Permafrost is the name for the frozen ground underneath the Arctic soil that remains at or below freezing temperatures for two or more consecutive years. Its presence can significantly impact ecosystems and infrastructure in the Arctic region.
Permafrost is the layer of permanently frozen ground that lies underneath the top soil of the tundra. It remains frozen year-round and can be several meters thick in some areas. Permafrost plays a crucial role in regulating the hydrology and stability of tundra ecosystems.
Potting soil can leave stains because it contains organic matter like peat moss and compost that can release pigments when wet, causing discoloration. Additionally, the soil may contain minerals and salts that can leave behind residue as it dries on surfaces.
Carbon goes back into the soil when dead animals decompose.
It is a worm
Bedrock is not a layer of mature residual soil. Bedrock is the solid rock underneath the soil layers that make up the Earth's crust. Residual soil forms from the weathering of bedrock over time.
Well, most vegetables grow underneath the soil so first, you buy the seed and plant it in a fresh batch of soil and water it until it grows.