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

Crossword clues for Porous rocks:

TUFA: Porous rock.
TUFA: Soft, porous rock.
TUFF: Porous rock.
TOPHI: Porous rocks: Geol.
SHALE: Porous rock.
TOPHI: Porous rocks