With some information now at our disposal concerning the structure of vegetation and its organization into plant communities, associations, formation-classes, and biochores, we can study the environmental factors which require vegetation to assume such varied forms.
The four main classes of environmental factors are
(1) climatic,
(2) geomorphic (related to land form).
(3) edaphic (related to soil), and
(4) biotic (related to living organisms).
Although we treat each of these classes of factors in turn and examine each factor separately, it must be kept in mind that the basic concept of ecology is that many factors act simultaneously and that factors affect one another in a most complex interrelationship. The very plants that are affected by environmental factors may react in such a way as to modify the environment and thus change the factors themselves.
In considering how various factors of the physical environment influence plant structures and distributions, two scale ranges can be treated. One is essentially the global scale and consists of such climatic factors as the seasonal and latitudinal patterns of insolation, light and darkness, temperature, precipitation, and prevailing winds. The other scale of consideration is that of variation of the physical environment found within a relatively small habitat and between adjacent habitats. Thus although there are vast global climate patterns of deserts and humid regions, we may also find within a region of generally humid climate a few small habitats (such as dune or cliff) which are extremely dry places for plants to live.
Locals hypothesize that the legacy of Italian blood and culture in Cologne, colonized by the Romans more than 1500 years ago, makes the people more jovial and lighthearted. Cologne is the largest city on the Rhine.
Kolsch is not only the dialect spoken here but, also the name of their own top-fermented beer. There are more than 4,000 pubs, restaurant's and brewery taverns in Cologne.
Unlike many of the world's large cities, Cologne, with a population of over a million, gets better every day, there are more things to do and see, more new and innovative buildings... more
Travel is an opportunity to learn, whether geography, languages, history or other subjects.
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Cologne is situated on the beautiful Rhine River.