This course was written by Suresh Nesaratnam.
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Grateful acknowledgement is made to the following sources.
Figure 1: Cartoon by Ajit Nunan. Courtesy of the Centre for Science and Environment, New Delhi.
Figure 3: Department of Geology and Geography, Ohio Wesleyan University.
Figures 7, 9 and 10: Copyright © CNRI/Science Photo Library.
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