What compositional feature defines the region where temperatures were low enough for water, methane, and ammonia to condense into solids?

Answer

The frost line

Beyond the frost line (or ice line), temperatures dropped sufficiently for volatile compounds to condense into solid ices, allowing planetesimals in this region to grow much larger by incorporating more abundant icy material.

What compositional feature defines the region where temperatures were low enough for water, methane, and ammonia to condense into solids?

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