True, first the horse ppl invade then and start pillaging and what not. then china brakes in a bunch of pieces. then it rebuilt its self. then mongols, then japan, then Chinese civil war now modern day COMMUNIST china.<span />
Japan is densely populated because it is an island nation which means that there is not a lot of territory for the Japanese to spread out and inhabit. In addition Japan has a large population for the small territory that exists. A final reason is that much of life in Japan is centered around urban zones, which means that most of the population lives in these urban environments which are very dense.
B. The rivers were used to sustain life by growing crops and food and having an unlimited drinking supply.
If the coast-to-coast distance is about 2900 miles, it will take about ...
... (2900 mi)/(186000 mi/s) ≈ 15.6 ms
for the signal to travel coast-to-coast at light speed.
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There are time delays due to the amplifiers and repeaters required in the path, and due to the fact that the signals don't actually travel at the speed of light in a wire.
A test of internet speed between Seattle and Washington, DC shows a round-trip time of about 87 ms when traffic is light. Modern communication channels tend to be faster than the telegraph (especially when measured in words per minute).
Manufacturing industries engage in production of goods (finished products) that have value in the marketplace service industries include those industries that do not produce goods and instead provide services