What characterizes a continental polar air mass?

A continental polar air mass is characterized by cool temperatures and low humidity, making it predominantly cool and dry. It originates in high-latitude regions over land, particularly in areas with cold climates, such as northern Canada or Siberia. Because it forms over land rather than water, it lacks significant moisture, which contributes to its dry nature.

The correct answer emphasizes the cool and dry conditions typical of a continental polar air mass. This type of air mass can influence weather patterns by bringing cooler temperatures and less humidity, often resulting in clear skies and stable atmospheric conditions when it moves into a region.

In contrast, the other options describe characteristics of different types of air masses. For instance, one of the options suggests that the air mass forms over warm tropical waters, which aligns more with tropical maritime air masses that are warm and humid. Another option describes warm, humid conditions, which are not typical of continental polar air masses. Lastly, referring to high moisture content is inconsistent with the dry nature of continental polar air, which is essential to its identification and classification.