By Reuel R. Hanks
How did the Greek geographer Eratosthenes make a correct calculation of the earth's situation greater than 1,500 years prior to the 1st voyage of Columbus to the recent global? What are the "green belts" of britain that dominate its rural panorama? and what's considered as the driest continent at the planet?This instruction manual deals a huge insurance of terminology and ideas, serving as either an encyclopedic dictionary of geography phrases and an approachable review to the human and actual features of worldwide geography. nearly one hundred fifty geographic phrases and ideas are outlined and mentioned, delivering an obtainable reference for a person who calls for a deeper wisdom of the language and ideas which are very important to geography as a self-discipline. worthy sidebars are supplied to make clear strange or arguable theories and ideas. All significant geographic recommendations and phrases are addressed and comprehensively defined utilizing examples.
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Additional info for Encyclopedia of Geography Terms, Themes, and Concepts
Sample text
Even though the near-surface air is very hot, its propensity to rise is countered by the strong descent of air from aloft. When the subtropical high is overhead of a region there is usually a paucity of precipitation. Indeed, the presence of the Sahara, Australian deserts, the Atacama, and the Kalahari share 15 16 Areal Differentiation the common characteristic of the year-round presence of subtropical highs. Adjoining regions are not as dry because the subtropical highs are not entrenched throughout the year.
Only subsistence agriculture is found at this elevation, as the climate is too cold to support any commercial crops. The highest zone is the tierra nevada, found only in the Andean region of South America. Located above 15,000 feet, the nevada is an environment dominated by snow pack and glaciers, and does not support any permanent human settlement. Agriculture is nonexistent, and even animals adapted to high altitude do not survive for extended periods in the extreme conditions of the tierra nevada.
Two things happened to increase the oxygen supply. They were (1) the formation of the ozone (O3) layer 29 30 Biogeochemical Cycles that screens most of the ultraviolet energy form the lower atmosphere, and (2) the buildup of breathable oxygen (O2) as a chemical byproduct of photosynthesis that was allowed once the ozone layer was established. Additionally, oxygen enters the atmosphere as part of water vapor during evapotranspiration and via the weathering of rocks (oxygen is the most prominent component of rock at the planetary surface).
