Rating | Solver | Clue |
---|---|---|
TOPSOIL | Uppermost earth layer | |
SUBSOIL | Earth layer | |
OZONE | Earth's protective layer | |
SOIL | Top layer of earth | |
CRUST | Outermost layer of the earth | |
MANTLE | Middle layer in the earth's internal structure | |
SLOAM | A layer of earth between coal seams. |