The correct answer is: True.
Fog is a major hazard to aviation because it can reduce visibility to a point where it is unsafe to fly. In severe fog, pilots may not be able to see the runway or other aircraft, which can lead to collisions. Fog can also cause aircraft to lose altitude, which can be dangerous if they are not prepared.
There are a number of ways that fog can form. One way is when warm, moist air meets cold air. The warm air rises and cools, and the water vapor in the air condenses into fog. Another way that fog can form is when there is a lot of moisture in the air and the temperature drops below the dew point. The dew point is the temperature at which water vapor in the air condenses into liquid water.
Fog can be a major problem for aviation, but there are a number of things that can be done to mitigate the risk. One way is to use radar to help pilots see through the fog. Another way is to use instrument landing systems (ILS), which help pilots land their aircraft safely in low visibility conditions.
In conclusion, fog is a major hazard to aviation because it can reduce visibility to a point where it is unsafe to fly. There are a number of ways that fog can form, and there are a number of things that can be done to mitigate the risk.