dewey decimal redirects here it is not to be confused with duodecimal the dewey decimal classification ddc or dewey decimal system is a proprietary library classification system first published in the united states by melvil dewey in 1876
physical geography The scientific study of the natural features of the Earth's surface, especially in its current aspects, including land formation, climate, currents, and distribution of flora and fauna. Also called physiography.
The continents are part of the uppermost layer, and they move slowly around Earthâs surface. What You Will Learn â¢ Earthâs interior can be divided into layers based on chemical composition and physical properties. â¢ Scientists use seismic waves to study Earthâs interior.cientists think about Earthâs layers in two waysâin terms of their chemical composition and in terms of their physical properties. The Compositional Layers of Earth Figure 1 shows how Earth is divided into three layers based on chemical composition.