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now, the degree of urbanization has been deepening and we enjoy the convenience brought by urbanization. how does everybody know how the cities began? long time ago, the world had only a few thousand people. these people moved from place to place, hunting animals for food. no one knows how or when these people learned about growing food. but when they did, their lives changed greatly. one thing is certain that they gathered in the rich place or near water. in that age, water and climate are the most important to lives. it is the rich water and comfortable climate that gathered people from different places. they began to live near one another, so that the first village grew. many people came to work in the villages. then the villages became bigger and bigger.when machines were invented, life in the villages changed again. factories were built. there were a growing number of people living near factories. because of the increasing people, more and more buildings were built. and then cities were built.