A revised and updated edition of this essential guide to Geology for both students and the general reader The second edition of the Collins Dictionary of Geology, first published in 1987, is a fully comprehensive and up-to-date dictionary of geology, encompassing all the major areas of study in over 4500 entries, making current terminology accessible for the general reader while retaining the breadth and depth of explanation required by students of geology. The text has been fully revised and updated to cover all the major areas of geological study, including practical and economic applications.