Geography is the study of the Earth. Which includes the study of weather, climates and stuff to that effect. We study geography because, we get a better understanding of the environment and cultures that are all around us in the world. When we study geography we use the land, and can also tell you the cultures that live in that region. It effects us by predicting the weather, and climates around us. So one day you can predict the weather for a short period of time. The climate beening predicted is a long term thing that stays the same for a while.