Question

an air mass is a large area of earths lower atmosphere. an air mass contains air with similar temperatures and similar humidity levels, or amounts of moisture. which of the following descriptions best fits the definition of an air mass? an area above northern africa that contains dry air with temperatures of about 33°c an area above eastern canada that contains humid air with temperatures between -5°c and 15°c an area above the western united states that contains dry air and humid air at roughly the same temperature

Explanation:

To determine the best fit for an air mass, we check the definition: a large area with similar temperatures and humidity.

• First option: Northern Africa area has dry air and ~33°C (consistent temp and humidity).
• Second option: Eastern Canada has temp range -5°C to 15°C (not similar temp).
• Third option: Western US has dry and humid air (not similar humidity).

So the first option matches.

Answer:

an area above northern Africa that contains dry air with temperatures of about 33°C