Definitions from Wiktionary (snow line)

▸ noun:  The altitude, in a mountainous region, above which the ground is covered with snow, at any particular time.
▸ noun:  (astrophysics) The inner limit where volatile molecules can remain frozen in the zone around a star.
▸ noun:  (astrophysics, specifically) The limit for water remaining solid instead of evaporating away under solar radiation.
▸ Also see snow_line


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