What type of air mass is formed over polar regions?

The correct answer is that a continental polar air mass is formed over polar regions. These air masses originate over large land areas in the polar regions, such as northern Canada or Siberia, where the air is cold and relatively dry. Because they form over land rather than water, they lack the moisture that characterizes maritime air masses.

Continental polar air masses are typically stable and cold, which influences the weather patterns in regions where they move. They are associated with clear skies and colder temperatures, especially during the winter months when their effects are most pronounced. In contrast, maritime air masses, whether tropical or polar, form over oceans and tend to be warmer and more humid.

Air masses classified as continental tropical are generated over warm land areas, bringing dry and warm conditions, while maritime tropical air masses form over warm ocean waters, bringing moist and warm weather. Thus, the characteristics of continental polar air masses are distinctly tied to their origin in polar land regions, making this option the best answer.