What boundary separates the region where only rock and metal could solidify from the region where ices could also condense?

Answer

Frost line

The frost line delineates the distance from the central protosun beyond which temperatures were cold enough for volatile materials like water to freeze into solid ices, significantly impacting subsequent planet formation.

What boundary separates the region where only rock and metal could solidify from the region where ices could also condense?

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