Geography is the study of the location, extent, distribution, frequency and interaction of all significant elements of the human and physical environment on or near the Earth's surface, particularly its features and of the distribution of life on the earth, including human life and the effects of human activity. The word geography derives from the Greek γη (ge) or γαια (gaia) ("Earth") and γραφειν (graphein) ("to inscribe").Physical geography focuses on the physical, meteorological and ecological patterns and processes on Earth. Human geography focuses on economic, political and cultural processes and features in their spatial dimensions. In addition to studying human and natural features of Earth, Geographers also study Earth's place in the Solar System and the Universe and how this affects the Earth features (e.g. climate, sea currents and tides), as well as physical processes on other planets.