What exactly is the frost line?
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 air temperature would it freeze at?
user
A reference temperature of 0 degrees Celsius.
assistant
what is that in fahrenheit?
user