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the difficulty of setting railroad schedules over long distances
if you meant time zones there are 29, if you don't count poorly-wound clocks and daylight savings time
Universal Transverse Mercator (UTM) is a system that coordinates the positions on the Earth. This system divides the surface of the earth to sixty different zones.
Sir Sandford Fleming came up with the concept of world time zones in 1879. Charles Dowd was an American who developed a system of time zones for American railroads.
The earth rotates on its axis once every twenty-four hours. It rotates toward the east, which is why eastern time zones experience sun rise before western time zones.
There were no time zones anywhere in the world before the United States railroads set up the system. Before time zones all clocks were set to local time based on when the sun reached noon in that town. This made it impossible for the railroads to create workable train schedules throughout their entire system. Time zones made it possible to schedule trains and keep them operating on schedule.
Source zone , transition zone and the flood plain zone.
Rift zones are a large area of the earth which plates of the earth's crust are moving away from each other, which then forms an extensive system of fractures and faults. How do rift zones form when two tectonic plates pull away from each other.
Could be either, depends on the type of system.
latitude
Study Island answer: to prevent soil erosion
latitude