Answer: trass

AnswerCrossword Clue
TRASSVolcanic earth
trasslight-colored type of volcanic tuff used in making water-resistant cement and mortar
trassa volcanic rock, also TERRAS
TRASSRhine pumice rock
TRASSVolcanic rock
TRASSVolcanic rock.
TRASSVolcanic stuff.
TRASSKind of volcanic rock.
TRASSVolcano tuff.
TRASSYellowish volcanic earth.
TRASSVolcanic earth.
TRASSRock.
TRASSPumice rock.
TRASSRock composed of pumice.
TRASSVolcanic tufa.
TRASSLight-colored tuff.
TRASSVolcanic tuff.