Geography mixes hard science and the humanities to show how humans have grown over the ages. Cultural geography studies how culture and geography affect one another. Physical geography examines the physical aspects of the world, such as water and landscapes.
Cultural geography looks at food, religion, building styles, transportation and politics, among many other aspects of culture and civilization that are affected by geography. It also focuses on the ways in which culture affects the physical earth. A civilization built in an area protected from invasion by mountains is a prime example of something that would be studied in cultural geography.