is the creation of zones to explain the different characteristic climates
at different elevations
. The different zones can support different vegetation
, etc. As one moves to higher elevation points one enters different altitudinal zones. The lowest zone being Terra Caliente, and the highest zone being Tierra Helado. Founded by a geographer named Humboldt. Humboldt is also credited with Environmental Lapse Rate - the measure of how many degrees temperature drops as you move to higher elevation (3.5 F every 1,000ft.).