The distance from the Sun where ice and gases become prevalent on a planet's surface relative to liquid water is defined as the frost line.
A frost line also known as frost depth or freezing depth, is the depth to which the groundwater in soil is expected to freeze.
It is the distance from the Sun where ice and gases become prevalent on a planet's surface relative to liquid water.
Thus, the distance from the Sun where ice and gases become prevalent on a planet's surface relative to liquid water is defined as the frost line.
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