Solved cryptogram
Metamorphic rock is remade by heat and pressure without melting. Melting would erase it.
Earth Science Facts, sourced to U.S. Geological Survey.
Solve it yourself
This fact is a cryptogram here: 73 letters over 20 different ones, graded medium.
Or go to the puzzle’s own page first.
What it means
The word means changed in form, and the change happens while the rock stays solid. Minerals recrystallize, flatten and line up under pressure, which is why slate splits into sheets and why marble is denser and finer than the limestone it came from. Cross the melting point and the identity of the original rock is gone, so metamorphism runs in a band of temperature between burial and destruction.
The claim comes from U.S. Geological Survey.
- SourceU.S. Geological Survey
- CollectionEarth Science Facts
- Difficultymedium
- Length73 letters, 20 of them different
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