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Regional geography is also a particular approach to the study of geography, comparative geography with significant quantities or locations. This approach was dominant in the second half of the 19th century and the first half of the 20th century, a time when the then regional geographical model was central in the geographical sciences. It was later criticized for its descriptive nature and lack of theoretical basis. Strong criticism came in the 1950s and the quantitative revolution. The main critics were GHT Kimble[12] and Fred K. Schaefer.[13] Physical geography Physical geography is a branch of geography that is primarily concerned with the systematic study of patterns and processes occurring in the hydrosphere, biosphere, atmosphere, geosphere, and lithosphere. It is intended to help people understand the physical arrangement of the Earth, its climate, and its patterns of flora and fauna. Many areas of physical geography draw on knowledge from geology, particularly in the study of weathering and erosion. For the geology of other planets in the Solar System, see Geology of the Solar System. Physical geography as a normal science contrasts with and complements its sister discipline, Human Geography. Mathematicians look for patterns[9][10] and use them to generate new hypotheses. They justify the validity or falsity of hypotheses by mathematical proof. When mathematical structures are good models of reality, mathematical reasoning can provide insights or predictions about nature.