Question

which air masss approach is indicated by a rising barometer?
o cold, wet air mass
o cold, dry air mass
o warm, wet air mass
o warm, dry air mass

Explanation:

A rising barometer indicates increasing air pressure. Cold, dry air is denser (more molecules per unit volume) than warm air (molecules are more spread out due to higher kinetic energy from warmth) and dry air is denser than wet air (water vapor molecules are lighter than the main components of dry air - nitrogen and oxygen). So a cold, dry air mass, being denser, causes a rising barometer.

Answer:

cold, dry air mass