Earth Science Facts
The planet underfoot and the ocean on top of it, cited to the surveys that measure them.
19 cryptograms, each one a fact written for this site rather than a sentence taken from a book. Cited to 5 sources, NOAA the most common.
How they are kept honest
Every claim names where it came from, and every source was read on the day it was cited, between 2026-08-27 and 2026-08-27. 1 of them can change over time and carry a date by which somebody should check them again; the rest cannot.
- NOAA6
- U.S. Geological Survey6
- NASA4
- Royal Society of Chemistry2
- U.S. National Park Service1
How hard they are
1 easy, 15 medium and 3 hard, graded by the model described in our guide to solving cryptograms.
They average 74.5 letters over 19.6 distinct ones, with 4.1 letters appearing exactly once.
Every one of them
Each has a page of its own naming its source, and its answer on a separate page so you will not run into it by accident.
- Royal Society of Chemistrymedium, 75 letters
- Royal Society of Chemistrymedium, 72 letters
- NASAmedium, 76 letters
- NOAAhard, 73 letters
- NOAAmedium, 74 letters
- NOAAmedium, 74 letters
- NOAAmedium, 67 letters
- NOAAeasy, 70 letters
- NOAAmedium, 75 letters
- U.S. Geological Surveymedium, 71 letters
- U.S. Geological Surveymedium, 76 letters
- U.S. Geological Surveymedium, 74 letters
- U.S. Geological Surveymedium, 78 letters
- U.S. Geological Surveyhard, 78 letters
- U.S. National Park Servicehard, 72 letters
- NASAmedium, 82 letters
- NASAmedium, 75 letters
- NASAmedium, 74 letters
- U.S. Geological Surveymedium, 79 letters