This dictionary combines the most widely used scientific, technical and general terms in the various Earth Sciences: geology, pedology, petrography, petroleum and mining geology, planetology, sedimentology, stratigraphy, tectonics… It represents an important bilingual terminological source at the same time specialized and synthetic. Students, researchers and professionnals will find herein an indispensable basis of documentation and translation. It will help, in particular, to remove possible doubts over the choice of the appropriate word when translating from one language to the other. J.P. Michel is a lecturer at the Université Pierre and Marie Curie (Paris). R.W. Fairbridge is emeritus Professor at Columbia University (New York). M.S.N. Carpenter is a professional translator (Rennes).