Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'fog'?

A. A natural fog contaminated by industrial pollutants, a mixture of smoke and fog.
B. Water droplets suspended in the atmosphere in the vicinity the earth's surface that affect visibility.
C. A common type of fog, produced over a land area when radiational cooling reduces the air temperature to or below its dewpoint.
D. A type of fog formed when air flows upward over rising terrain and is, consequently, adiabatically cooled to or below its dewpoint.

Answer: Water droplets suspended in the atmosphere in the vicinity the earth's surface that affect visibility.