Question

how are air masses classified? by the area over which they form and the temperature associated with them by the area over which they form and their shape by the area over which they form and their speed and direction by the area over which they form and their height

Explanation:

Air masses are classified based on the source region (the area over which they form) and their temperature (polar or tropical, for example) and moisture characteristics. The first option mentions the area (source region) and temperature, which aligns with the standard classification of air masses (e.g., continental polar, maritime tropical, etc.). The other options involve shape, speed/direction, or height, which are not primary classification factors for air masses.

Answer:

by the area over which they form and the temperature associated with them