The Atmosphere, Humidity of the Atmosphere, Precipitation, The Ocean, Salinity of the Sea, Temperature of the Ocean, Waves and Tides, Currents, Deposits on the Ocean Floor, Coral Reefs and Islands, The Land, Earth Movement, Shore Lines, Deltas and Estuaries, Earth Sculpture, Rivers, Development of River-Systems, Underground Water, Snow and Ice, Wind, Volcanoes, Lakes. (Topical Term)