PHYSICAL GEOGRAPHY
Has many things in common with both astronomy and geology, as it discusses the physical condition of the earth and its relations as a member of the solar system; describes its great natural divisions of land and water; and takes account of dynamic forces, such as aerial and oceanic currents, that are constantly causing important changes. The whole exterior structure of the earth, the phenomena of rain and dew, fog, frost, and snow, are geographical questions, to be discussed with special reference to the general laws or principles involved. It shows unity in the midst of diversity, and constancy of phenomena in the midst of apparent changes.