What is an air mass and what determines its properties

Air mass: an extremely large body of air (thousands of square kilometers) whose properties of temperature and moisture are fairly similar in any horizontal direction at any given altitude. The propertiesof an air mass is determined by the type of surface over which it develops, source region.

Physical science b final exam bernoulli’smovepowercompound translucent the sun i was having such a pain for this searching every question so i hope i made someone happy

We have no idea what the graph shows, or why it may be accurate,  because we can't see the graph.on a different subject, choice ' d ' is the only true statement among the choices.