The increasing necessity of nature as a renewable energy source means that understanding aspects of physical geography have never been so important. This includes the use of the earth’s waters ...

Physical geography not only describes natural phenomena near the ... Particularly with respect to digital information, the nature of geographical data that vary with scale, time, and spectral ...

(1) Our Physical World: a Source Book of Physical Nature-Study. By Elliot Rowland Downing. With a Chapter on Radio Communication, by Fred G. Anibal. (University of Chicago Nature-Study Series.) ...