In the previous lesson, we learnt how man got used to forming villages and living in them since the ancient times. People who lived in those villages for a long time made progress day by day. Some villagers became wealthy as a result of farming and rearing animals. But some other villagers had to do their farming in infertile plots of lands, for which getting water facility was difficult. They could not get a good harvest and as a result their livelihood became difficult.
They were considered the poor. This led to a division in the society as rich and poor. Some time later, the rich and their relatives started living separately from these villages. Such places which consisted of houses made of stones instead of clay and wattle, well constructed streets, moats, walls and temples (shrines) for worshipping were called cities.These rich villagers were called citizens. Hereafter, they never engaged in farming or rearing animals. Instead, the poor villagers cultivated the land that belonged to the rich. But much of the harvest was taken by the wealthy people who lived in the cities.
A civilization means such kind of cities and the citizens who lived in them. A city was larger than a village. These citizens practised writing scripts. There was a group of citizens to rule the cities. The people who lived in the cities built religious places. They were engaged in trade with distant countries. Therefore, these basic characteristics help understand what a civilization is.
Thus, people who lived in various parts of the world in different eras built their own civilizations. Mesopotamian civilization, Nile River Valley civilization, Indu Valley civilization and Hwang Ho civilization were of the oldest of them.
It is important for us to learn about civilizations because various things which were produced by those who lived then are useful for our lives even today.
In mathematics we learn that a circle has 360 degrees. We know that there are 60 seconds in a minute and 60 minutes in an hour. This was taught to us by the mathematicians who lived in the ancient Mesopotamian civilization.