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 the western united states that contains dry air and humid air at roughly the same temperature 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

Explanation:

An air - mass has air with similar temperatures and humidity levels. The first option has both dry and humid air, so it doesn't fit. The second option only mentions dry air and a single temperature value without indicating similar humidity levels. The third option describes an area with humid air and a range of temperatures, but it doesn't clearly state similar humidity levels for the entire range. However, compared to the others, it is the closest as it has a defined area with air of a certain moisture type (humid) and a temperature range.

Answer:

an area above eastern Canada that contains humid air with temperatures between - 5°C and 15°C