What exactly is the frost line?
user
A hypothetical temperature at which any water not in contact with air would freeze.
assistant
What temperature would it freeze at?
user
That depends on how much water there is and what the air temperature is.  There are different forms of the question.
assistant
What exactly is the frost line?
user
A hypothetical temperature at which any water not in contact with air would freeze.
assistant
What temperature would it freeze at?
user
0 degrees Celsius
assistant
What exactly is the frost line?