Solved cryptogram
At least half the oxygen you breathe was produced in the ocean rather than by trees on land.
Earth Science Facts, sourced to NOAA.
What it means
The work is done by plankton, drifting algae and photosynthetic bacteria, all of them individually invisible and collectively enormous. One group of marine bacteria may account for a fifth of the oxygen in the atmosphere on its own. The exact share is hard to pin down because the ocean also consumes oxygen, so estimates vary, but the ocean contribution is at least as large as the land one.
The claim comes from NOAA, and the page it comes from was read on 2026-08-27 to confirm it still says this.
This one can change, so it is due to be checked again by 2028-06-01.
Solve it yourself
This fact is a cryptogram here: 74 letters over 20 different ones, graded medium.
- SourceNOAA
- CollectionEarth Science Facts
- Difficultymedium
- Length74 letters, 20 of them different
Nearby in the collection
The facts either side of this one.
About as hard as this one
Scored closest to it by the model behind our guide to solving cryptograms.
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- U.S. Geological Surveyhard, 78 letters
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