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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Soil layers 4 letters:

GLEY: Wet soil layer
SOLA: Soil layers
LOAM: Soil layer
HARDPAN: Compact soil layer
PLATY: Like layered soil.
SOLUM: Soil layer
PERMAFROST: Layer of soil that never thaws
HARDPAN: Clay layer under soil
HARDPAN: Firm layer of clay underlying soft soil.