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The material in these pages is provided as an aid to the students and demonstrators of the Part III Physics of the Earth as a Planet course at Cambridge University. The material may be freely downloaded for personal use. No material in these pages may be used as part of any course in this or any other institution without our express consent. The copyright of the individual sets of lecture notes, practical sheets and example sheets belongs to their authors (as noted on each set). Copyright of all images lies with the authors of the lecture course unless otherwise noted. Images for which the copyright does not belong to us have been reproduced with permission by the copyright owners. We are not in a position to give consent to the non personal use of images for which we do not own the copyright.