The Yellow River region. The civilization of ancient China first developed in the Yellow River region of northern China, in the 3rd and 2nd millennia BCE. A large part of this area is covered by loess soil. In Chinese history, the Yellow River is not just a river; it stands for the origins of culture and civilization. ... That is because the Yellow River was the birthplace of ancient Chinese civilizations in the Xia (2100–1600 BC) and Shang (1600–1046 BC) eras — the most prosperous region in early Chinese history.
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A polis (plural: poleis) was the typical structure of a community in the ancient Greek world. A polis consisted of an urban centre, often fortified and with a sacred centre built on a natural acropolis or harbour, which controlled a surrounding territory (chora) of land. The term polis has, therefore, been translated as ‘city-state’ as there was typically only one city and because an individual polis was independent from other poleis in terms of political, judicial, legal, religious and social institutions and practices, each polis was in effect a state. Like a state, each polis was also involved in international affairs, both with other poleis and non-Greek states in the areas of trade, political alliances and wars. Other cultures had a similar social and political structure, notably, the Babylonians, Etruscans and Phoenicians, and the latter are believed to be the originators of the polis as a communal unit.
The polis emerged from the Dark Ages which followed the fall of the Mycenaean civilization in Greece and by the 8th century BCE a significant process of urbanisation had begun. There were eventually over 1,000 poleis in the Greek World but among the most important were Athens, Sparta, Corinth, Thebes, Syracuse, Aegina, Rhodes, Argos, Eretria, and Elis. The biggest was Sparta, although with some 8,500 km² of territory, this was exceptionally large and most poleis were small in size. However, poleis such as Athens, Rhodes and Syracuse possessed significant naval fleets which also allowed them to control wide areas of territory across the Aegean
<span>Russian Sturgeon is a ancient species of fish which is about 4 meters long. The fish is a rare one with bones in it and weighs about 160 kg. They usually found near Bulgaria, Russia and Turkey. The population the Russian sturgeon further declined because of the construction of dams on the Volga</span>
