This activity uses a simplified version of the Holdridge Classification of World Life Zones, devised by ecologist L.R. Holdridge and tested in Costa Rica and Thailand. The interaction of these two factors determines what vegetation appears in an ecosystem and how it is distributed within. Other factors also interact to determine environmental conditions, such as the movements of air masses and local and regional topography. Convert measurements to metric if necessary. Have students calculate the average total annual precipitation for their school and the average annual biotemperature by adding the monthly figures and dividing by 12.
Student now have the two points needed to plot their school's life zone.
Have students locate the corresponding points on the appropriate axes, and simultaneously trace them inward until they converge. They may now classify their school's life zone. Using United States and local topographic maps, atlas, or almanac, have students identify their school's latitude and elevation. Using a world topographical map or atlas , have students identify locations sharing their school's latitude. Ask them if they think those places share the same environmental conditions as their school.