the division of land into zones based on elevation, which in turn helps determine climate and vegetation
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
line marking the upper limit of tree growth in mountains or northern latitudes (Tierra Fria)
the trading of crops between lowland and highland areas
the diversity of plant and animal life in a particular habitat
process by which carbon and oxygen are exchanged among plants, animals, & the environment
the removal of trees
development that meets the needs of the present without compromising the ability of future generations to meet their own needs.
a broad leaf evergreen forest found in wet and hot regions near the equator
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