Noun
English Wikipedia has an article on:life zoneWikipedia
life zone (plural life zones)
Any large portion of the Earth's land area which has a generally uniform climate and soil and therefore a high degree of uniformity in the composition of species; a number of different classifications have been proposed by different people.
Lower Sonoran The Lower Sonoran life zone spans from the Colorado River up to convert. Source: Internet
Ponderosa pine forests grow at elevations between convert, on both North and South rims in the Transition life zone. Source: Internet
The rain shadow of the Sierra causes the eastern slope to be warmer and drier: each life zone is higher in the east. Source: Internet