Final answer:
Unstable air is characterized by turbulence and good surface visibility. Turbulence refers to the irregular motion of air particles, while a good surface visibility means that the air is clear and transparent.
Step-by-step explanation:
Unstable air is characterized by turbulence and good surface visibility. Turbulence refers to the irregular motion of air particles, which can cause disturbances and fluctuations in the atmosphere. This can lead to changes in wind speed and direction, as well as the formation of wind gusts and eddies. Good surface visibility means that the air is clear and transparent, allowing for easy visibility of objects on the ground or at the surface.