Circulation Sea water evaporates and becomes vapor. It is cooled in the sky and becomes cloud. Cloud makes rain and it fall down on the ground and sea. Water circulates like this. Herbivorous animals eat plants and carnivorous animals eat herbivorous animals. They die in due time and their dead bodies become nutrition for plants. Life also circulate like this. People work and get money. They buy things and service from companies. They get a profit from customers and distribute the profit to their workers and stockholders. Money circulate like this. People marry and make children. Children grow, then marry and make children. These are repeated. Even if people die, their descendants prosper. This may be a kind of circulation. Circulation seems to be nature of us.