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By Richard Garratt

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Conclusions Geography plays a key role in determining where farms and cities have become established. Agricultural lands are found only where the climate permits crops to grow or domesticated animals to survive and graze. Very cold and very dry parts of the world are not suitable for agriculture. The very high latitudes (the polar regions), besides being cold, also have the disadvantage of short winter days or even darkness, so that the growing season is very limited. Cities, on the other hand, are generally situated where communications are good rather than where agricultural productivity is highest.

But the expansion of agricultural areas and the spread of civilization generated the need to travel and trade between settlements, and it was then that communications became the most important feature in the success of a city. The growing importance of communications in the world is well illustrated by the example of the Roman Empire, which once ruled the entire known world of its time. It was based upon one city, the so-called Eternal City of Rome. By 2,000 years ago, the armies of Rome had become the dominant force in what are now Europe, western Asia, and northern Africa.

Finally, farmland and cities affect their local climate, known as the microclimate. The concrete structures of the city and the hedges, woodland, and arable crops of the agricultural areas all have an impact on the movement of air in their vicinity. Light penetration, temperature variation, and the humidity of the air are all affected by the development of the cities that house us and the fields that supply our food. These, in turn, affect the lives of the creatures that share our habitats. CHAPTER 2 GEOLOGY OF FARMS AND CITIES Geology forms the basis of every ecosystem.

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