The clue "Rust formation" last appeared in the Thomas Joseph - King Feature Syndicate crossword on February 20, 2016. The correct answer for this puzzle is "OXIDATION", a 9-letter word.
Solution OXIDATION is 9 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is OXIDATION with 9 letters, and the shortest is OXIDATION with 9 letters.
No, "RUST FORMATION" hasn´t seen a spike right now. Solvers are most interested in: Gathering, Faster, Position, Frenzied and Signal.
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The solution is 9 letters long.