| Answer | Crossword Clue |
|---|---|
| HEN | Layer, but not a stratum |
| stratums | STRATUM, a layer of material |
| strata | stratum (a layer of material) |
| stratas | STRATA, stratum (a layer of material) |
| substratum | something that is spread or laid under something else; a stratum or layer lying under another |
| litters | Decomposing but recognizable leaves and other debris forming a layer on top of the soil, esp. in forests |
| altostratus | Cloud forming a continuous uniform layer that resembles stratus but occurs at medium altitude, usually 6,500û23,000 feet (2û7 km) |
