A layer of soil at the surface of the ground is subsoil. Subsoil is made up of small particles including silt, sand, and clay.
permafrost
Ground
Regolith.
Permafrost is the layer of permanently frozen ground that lies underneath the top soil of the tundra.
a soil horizon is a special layer in the soil which measures parallel to the soil surface.
permafrost
Ground
Topsoil.
Regolith.
Permafrost is the layer of permanently frozen ground that lies underneath the top soil of the tundra.
a soil horizon is a special layer in the soil which measures parallel to the soil surface.
earth's crust, soil layer, outer layer
ground soil.
Soil is the topmost layer of the Earth's crust.
Regolith.
litter
Regolith.