Living in a Big city and in a countryside

Thesis statement:

Living in a big city or in a countryside differs in many ways.

There is a fresh air in the countryside whereas the air is polluted in big cities.
It is much safer to live in the countryside whereas it is very dangerous to live in a big city.
However, in a big city one can earn more money than in the countryside.
Additionally, living in a big city allows one to be up-to-date or socially and technically developed.