Which characteristics describe middle clouds regarding wind and visibility?

Middle clouds typically refer to clouds found in the middle altitude range, usually between 6,500 and 20,000 feet. These clouds are often associated with more dynamic weather patterns and typically exhibit characteristics impacted by the surrounding wind and visibility conditions.

The correct choice indicates that middle clouds can indeed be dark and turbulent. This is often due to their formation in unstable air masses where upward motion can lead to strong winds, turbulence, and varying visibility conditions beneath them. The dark appearance of these clouds can be attributed to the moisture they contain, which can lead to precipitation, further contributing to turbulent weather and reduced visibility.

In contrast, the other descriptions do not accurately represent middle clouds. For instance, calling them light and clear doesn't capture the typical turbulent weather associated with these clouds. Similarly, describing them as stable and calm overlooks the inherent instability they can exhibit, while the notion of uniform and gradually dissipating clouds doesn't align with the often dynamic nature of middle clouds, which can lead to abrupt changes in weather conditions.