Encyclopedia of Geography Terms, Themes, and Concepts
Climate change model scenarios are far from certain. Earth’s climate system is the product of an interplay of factors, many of t ...
animals and people. For instance, the tallgrass prairie of the eastern Great Plains has all but disappeared. Agriculture is prol ...
was commonly known as the “Great American Desert.” With time, settlement accrued in this grassland realm. Three technological in ...
the largest contiguous urban green belts in the world. Only the green belt associated with Canada’s “Golden Horseshoe” conurbati ...
groundwater is out of sight and moves much slower than streams, its nature is not appreciated by most people. Yet, its importanc ...
zone is the water table. The depth to the water table is highly variable around the planet, and humans have gravitated to the ar ...
Oases are interesting examples of situations where the water table is close to or at the desert surface (seeDeserts). Oases have ...
Mexico City, Venice, Tokyo, and Bangkok. Tens of meters of subsidence have been documented. Building foundations can fail, under ...
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H Heartland Theory A theory ofgeopoliticsproposed by J. Halford MacKinder at the beginning of the 20th century. MacKinder taught ...
convinced MacKinder that the vast expanses of Asia could be connected via rail. His thesis also was influenced byorganic theory, ...
Eastern Europe. Thus, MacKinder articulated the famous encapsulation of his argument: Who rules East Europe commands the Heartla ...
temperature increases. If an object loses more energy than it gains, its temperature decreases. If an object remains at a consta ...
The temperatures of the objects around us are based on their internal heat con- tent that is usually closely related to their te ...
In economic geography anentrepoˆtis often considered to have a hinterland. The hinterland region is the larger market space thro ...
To persist in the form of a gas, water must achieve much higher energy content than the liquid or solid states. In the dynamic s ...
sea level pressure of 1,013.2 mb, this means vapor pressure is, at best, a small frac- tion of atmospheric pressure. Dewpoint te ...
variability as theair massesbring surface air poleward and equatorward over the planet. For instance, winter satellite imagery f ...
Hurricanes are like many other occurrences in the physical geographic environ- ment: there are many small hurricanes and a few l ...
by the position of the subtropical high. Hurricanes have a definite seasonality. Even though it can be said that it is “always s ...
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