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altitudinal zonation

the division of land into zones based on elevation, which in turn helps determine climate and vegetation

snow line

the line on a mountain above which there is perpetual snow and ice (Tierra Helada)


the creation of flat areas on steep slopes for the purpose of farming

tree line

line marking the upper limit of tree growth in mountains or northern latitudes (Tierra Fria)

vertical trade

the trading of crops between lowland and highland areas


the diversity of plant and animal life in a particular habitat

carbon-oxygen cycle

process by which carbon and oxygen are exchanged among plants, animals, & the environment


the removal of trees

sustainable development

development that meets the needs of the present without compromising the ability of future generations to meet their own needs.

tropical rainforest

a broad leaf evergreen forest found in wet and hot regions near the equator

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