Can't figure out ___ oxide (what makes Mars' soil red)? The Universal crossword from August 14, 2025 used this clue. Answer: 4 letters.
___ oxide (what makes Mars' soil red) Crossword Answer
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Hints
Hint 1
meaning
Hint 2
clue words
Hint 3
anagram
Other Universal Clues (8/14/25)
| 1A: Animal shelter chorus |
| 5A: Thick carpet or haircut |
| 9A: "You wish!" |
| 13A: (Get out of the fast lane!) |
| 14A: Grow intellectually |
| 15A: "hahaha" |
| 16A: TALK AT THIS VOLUME |
| 17A: "My name is ___ Montoya" |
| 18A: Sharp flavor |
| 19A: Coach on the slopes |
___ oxide (what makes Mars' soil red) Crossword Clue FAQ
What is the 4-letter answer to "___ oxide (what makes Mars' soil red)" crossword clue?
The answer to the "___ oxide (what makes Mars' soil red)" crossword clue is IRON. This answer contains 4 letters and was confirmed in the Universal puzzle.
Which crossword used "___ oxide (what makes Mars' soil red)" clue?
This crossword clue most recently appeared in the Universal puzzle on August 14, 2025. Daily crossword puzzles often reuse popular clues, so this clue may appear again in future puzzles from the same publication or others.
What is the meaning of IRON?
The word IRON means: press and smooth with a heated iron. This definition provides context for why it fits the crossword clue "___ oxide (what makes Mars' soil red)".