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.elow the asthenosphere is the mesosphere, which is the lower part of the mantle. The mesosphere flows even more slowly than the asthenosphere. Figure 2 The Physical Structure of Earth Earthâs core has two layers. The outer core is a layer of liquid iron and nickel.