What happens to air when it is dry?

When air is dry, it has a lower relative humidity, which means it has a greater capacity to absorb moisture from its surroundings. This includes pulling water vapor from vegetation, soil, and other sources in the environment. The process is a result of the air's tendency to reach a state of equilibrium with the moisture content available around it. As the dry air interacts with vegetation, it can draw moisture away, leading to a decrease in the moisture content of plants, which can stress them and potentially affect their health.

In contrast, the other options do not accurately describe the behavior of dry air. Dry air does not retain moisture; rather, it actively seeks out moisture. It does not produce more moisture; rather, it consumes existing moisture. Additionally, while dry air can lead to certain temperature sensations, it does not inherently cool down the environment; rather, temperature changes depend on various factors, including heat transfer processes in the atmosphere.