From Aa toZweikanter this popular dictionary has now been revised and updated. This edition includes over 1000 new terms plus:. -accurate definitions without technical jargon. -many word origins. -hyphenation and pronunciation guide. -commonly used abbreviations. -a geologic time and life chart. The definitions in this book are drawn largely from the autoritative 36000-term Glossary Of Geology to which nearly 150 specialists from all fields of the geosciences contributed. Both the Glossary and this Dictionary were prepared as a service of the American Geological Institute a federation of geoscience societies united to provide information to the science community and the public.