In the previous two lessons you learned the fundamental difference between ser and estar - essence or condition, as well as some common uses for the verb ser. Estar is used to express geographic or physical locations. I'm in the laboratory.
Chile is in South America.
The one exception to this rule is that ser is used to tell where an event is taking place. Estar is used with adjectives to express a state or condition. The soup is cold. Estoy muy bien, gracias. I am very well, thanks.