Canals and inland waterways, natural or artificial waterways used for ... The lay of the land (topography) and particularly changes in water levels ... inland waterway transport is still more economical than any other kind of transport.
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6" (and any subsequent words) was ignored because we limit queries to 32 words.
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the answer is constructing a line perpendicular to a given line
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Location
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I searched on google maps, those are the coordinates for the city of chicago.
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Agriculture yielded more food, which made denser human populations possible, thereby supporting city development. Farming led to dense, settled populations, and food surpluses that required storage and could facilitate trade. These conditions seem to be important prerequisites for city life.