Solved cryptogram
Gather all the ozone that shields us from ultraviolet light and it would be a few millimeters thick.
Earth Science Facts, sourced to NOAA Chemical Sciences Laboratory.
Solve it yourself
This fact is a cryptogram here: 82 letters over 21 different ones, graded medium.
Or go to the puzzle’s own page first.
What it means
The layer is not a layer in any everyday sense. Ozone is a trace gas, a few parts per million even where it is thickest, spread through many kilometers of the stratosphere. Squeezed to sea level pressure the whole planetary supply would form a shell about three millimeters deep. That film is what absorbs the shortest ultraviolet wavelengths, which damage DNA directly, and it is why a small percentage change in it matters so much.
The claim comes from NOAA Chemical Sciences Laboratory.
- SourceNOAA Chemical Sciences Laboratory
- CollectionEarth Science Facts
- Difficultymedium
- Length82 letters, 21 of them different
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