The clue "Pumice source" last appeared in the Wall Street Journal crossword on December 8, 2016. The correct answer for this puzzle is "LAVA", a 4-letter word.
Solution LAVA is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is LAVA with 4 letters, and the shortest is LAVA with 4 letters.
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The solution is 4 letters long.