Which of the following does not encourage the formation of rainfall?

Descending wind does not encourage the formation of rainfall. When air descends, it warms up and becomes drier because its ability to hold moisture increases with temperature. This warm, dry air evaporates moisture from the ground, plants, and other sources, leading to arid conditions. Therefore, descending wind does not lead to the formation of clouds and rainfall, but rather clear, sunny weather. On the other hand, converging and ascending winds bring moist air together and upward, leading to cloud formation and eventually precipitation. Warm winds also contribute to the formation of rainfall by bringing warm, moist air to cooler regions where it can condense and form clouds.