| Answer | Crossword Clue |
|---|---|
| undersoil | the soil beneath the surface; subsoil |
| undersoils | UNDERSOIL, the soil beneath the surface; subsoil |
| subirrigations | to irrigate beneath the surface of the ground, as with water passing through a system of underground porous pipes or transmitted through the subsoil from ditches, etc. |
| underearth | the soil found beneath the surface of something |
| substrata | An underlying layer or substance, in particular, a layer of rock or soil beneath the surface of the ground |
| solifluction | The gradual movement of wet soil or other material down a slope, esp. where frozen subsoil acts as a barrier to the percolation of water |
