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This Concept Map, created with IHMC CmapTools, has information related to: History of Ozone Layer, Detection of where the ozone layer is and the thickness of layer 1924 1928 - Thomas Midgley synthesizes chloroflorocarbons (CFCs), 1800s 1830's Christian Schoenbein identifies ozone in lab., Christian Schoenbein identifies ozone in lab. 1845 Auguste de la Rive and J.C. de Marignac suggest ozone is a form of oxygen, G.M.B. Dobson develops ozone spectrophotometer to measure ozone abundance 1930 Theory of Ozone Layer is described by Sydney Chapman, Detection of where the ozone layer is and the thickness of layer 1924 G.M.B. Dobson develops ozone spectrophotometer to measure ozone abundance, Vienna Convention and Montreal Protocol - protecting the ozone layer and reducing usage of CFCs. 1996 Due to observations globally CFC production ends in US and Europe, 1900s between 1913 and 1919 Detection of where the ozone layer is and the thickness of layer, History of the Ozone Layer 1900s, Maximum levels of CFC in stratosphere are reached 2010 CFC production ends world-wide, History of the Ozone Layer B.C.E., Marie Cornu measures solar spectrum and discovers less UV light. 1881 Walter Hartley recognizes correspondance to UV cutoffand UV absorption by ozone, Detection of CFCs in the atmosphere by Lovelock 1977 First international meeting to address ozone depletion due to CFC usage., G.M. develops applications for CFCs late 1950s CFC uses expand rapidly, First international meeting to address ozone depletion due to CFC usage. 1982 Low ozone levels discovered over Antartica, History of the Ozone Layer TODAY, CFC uses expand rapidly 1973 Detection of CFCs in the atmosphere by Lovelock, Bates and Nicolet propose catalytic ozone destruction - suggesting halons, freon and CFCs are responsible for ozone depletion 1973 Detection of CFCs in the atmosphere by Lovelock, TODAY 2000 Maximum levels of CFC in stratosphere are reached, Low ozone levels discovered over Antartica 1985-1987 Vienna Convention and Montreal Protocol - protecting the ozone layer and reducing usage of CFCs., 600,000,000 B.C.E. The Ozone Layer forms: Oxygen molecules split to form single oxygen atoms. Ozone presence enabled organisms to develop and live on the land.