Final answer:
A characteristic of stable air is unlimited visibility, thus the correct option is C.
Explanation:
Stable air is defined as air that resists vertical motion and tends to remain in its original position. This type of air is usually associated with high atmospheric pressure, which creates a stable environment. One of the key characteristics of stable air is unlimited visibility. This means that there are no obstructions or disturbances in the atmosphere that would limit visibility.
To understand why stable air leads to unlimited visibility, we must first understand the concept of atmospheric stability. Atmospheric stability is determined by the temperature of the air and its surrounding environment. When the temperature of the air is similar to or cooler than the surrounding environment, the air is considered stable. This is because cold air is denser and therefore sinks towards the ground, preventing vertical motion.
In contrast, unstable air is characterized by warm air rising above cooler air, creating vertical motion and potentially leading to the formation of clouds and precipitation. This is why unstable air is often associated with thunderstorms and other types of severe weather.
Now, let's apply this concept to the given options. Stratiform clouds, or layered clouds, are often associated with stable air. This is because they form when a large area of stable air is lifted and cooled, causing the water vapor in the air to condense and form clouds. However, this does not necessarily mean that stable air will always lead to stratiform clouds. It is possible for stable air to maintain unlimited visibility without the presence of clouds.
On the other hand, cumulus clouds, which are characterized by their puffy and vertical appearance, are associated with unstable air. This is because unstable air allows for vertical motion, which can lead to the formation of cumulus clouds.
Therefore, out of the given options, unlimited visibility is the most accurate characteristic of stable air. It is important to note that stable air does not automatically guarantee unlimited visibility, as other factors such as humidity and wind can also affect visibility. However, in general, stable air provides a clear and unobstructed view of the surrounding environment. This is why stable air is often preferred for activities such as flying and outdoor events, as it allows for safe and clear visibility, thus the correct option is C.