The great rift valley in east Africa is being shaped by water due to erosion
Constantinople was able to survive due to its <em>strategic</em> location and <em>sofisticated</em> system of fortifications.
Constantinople was able to survive as the <em>central</em> hub of the European culture throughout the early 1000s due to its strategic location, the city was located in a strait between the Black and Mediterranean Seas, between Europe and Asia, which allowed the city to be prevented from many invaders, from Hunes to Arabs.
In addition, the city counted with a sophisticated system of fortifications which made impossible any attempt of siege until the appearance of first developments on modern artillery in the 15th Century, and the city was well communicated with the most important nations in Eastern and Western Europe by sea (i.e. Italy, Carolingian Empire, Kiev' Rus), of which the city may receive reinforcements in desperate situations.
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Answer:
B. Area's around the north and south pole
Explanation:
The polar zone encompasses the areas around the North and South Poles. Starting from the North Pole, this zone stretches to the Arctic Circle in the Northern Hemisphere, and reaches even further south in North America and Asia.
Because Of WoodBlock Printing
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