What phenomenon causes altitudinal zonation?

Name: What phenomenon causes altitudinal zonation?
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Altitudinal zonation is caused by the environmental lapse rate, which is the rate at which temperature decreases with increasing altitude. As altitude increases, the air becomes less dense, causing it to expand and cool. This results in different temperature zones at different elevations, which in turn leads to different vegetation types and ecosystems.

What Phenomenon Causes Altitudinal Zonation