What do we mean by the frost line when we discuss the formation of planets in the solar nebula?
A)It is a circle at a particular distance from the Sun,beyond which the temperature was low enough for ices to condense.
B)It is another way of stating the temperature at which water freezes into ice.
C)It marks the special distance from the Sun at which hydrogen compounds become abundant;closer to the Sun,there are no hydrogen compounds.
D)It is the altitude in a planet's atmosphere at which snow can form.

Question

Quizplus · Accepted Answer

The frost line is the circular boundary within the solar nebula beyond which the temperature was low enough for volatile compounds such as water, ammonia, and methane to condense into solid ice particles. This boundary was at a specific distance from the Sun and marked the transition from the inner region of the nebula, where only refractory materials could condense, to the outer region where ices could form.

What Do We Mean by the Frost Line When We