What is the difference between atmospheric depression and atmospheric instability?

<p style=";text-align:left;direction:ltr">Cases of atmospheric instability usually form in narrow geographic ranges or limited areas, and are not as comprehensive as air depressions. A state of atmospheric instability may form at the top of the mountain, but the other parts at the bottom of the mountain remain completely stable, but in the event that an air depression passes over the region, the Rain travels from the top of the mountain to the next part at the bottom of the mountain, and this is what distinguishes the atmospheric depressions. heat, in conjunction with its transmission to other areas. More</p>