Oral sources History Diagram
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COMPOSITION OF THE ATMOSPHERE
The proportion of gases changes in the higher layers of the atmosphere in such a way that oxygen will be almost in negligible quantity at the height of 120 km. Similarly, carbon dioxide and water vapour are found only up to 90 km from the surface of the earth.
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What is Oral History? Oral history is a method of conducting historical research through recorded interviews between a narrator with personal experience of historically significant events and a well-informed interviewer, with the goal of adding to the historical record
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