World Geography is a field of social science dedicated to the study of the lands, the features, the inhabitants, and the phenomena of the Earth. Modern geography is an all-encompassing discipline that seeks to understand the Earth and all of its human and natural complexities - not merely where objects are, but how they have changed and come to be. Geography has been called "the world discipline" and "the bridge between the human and the physical science". Geography is divided into two main branches: human geography and physical geography.