Answer:
Explanation:
An air mass forms whenever the atmosphere remains in contact with a large, relatively uniform land or sea surface for a time sufficiently long to acquire the temperature and moisture properties of that surface. The Earth's major air masses originate in polar or subtropical latitudes.
The answer for this qn is D.
How does water enter the atmosphere <span>it evaporates from water when heated by the sun. </span>
The crust makes up the land layer of the earth, also the top layer.