Which term describes the boundary between two air masses with different properties?

Which term describes the boundary between two air masses with different properties?

• A. Front
• B. Isobar
• C. Trough
• D. Ridge

Answer: (A)

A front is the boundary where two air masses with different properties meet, such as contrasting temperatures and humidity. This abrupt change in conditions creates a zone where the air is forced to rise or slide over the other mass, leading to cloud formation and often precipitation. The other terms refer to different atmospheric features: an isobar is a line of equal pressure, not a contact zone between air masses; troughs and ridges are elongated patterns in the pressure field (low and high pressure, respectively) that influence weather but do not describe the boundary between contrasting air masses.

A front is the boundary where two air masses with different properties meet, such as contrasting temperatures and humidity. This abrupt change in conditions creates a zone where the air is forced to rise or slide over the other mass, leading to cloud formation and often precipitation. The other terms refer to different atmospheric features: an isobar is a line of equal pressure, not a contact zone between air masses; troughs and ridges are elongated patterns in the pressure field (low and high pressure, respectively) that influence weather but do not describe the boundary between contrasting air masses.