McGraw-Hill Dictionary of Earth Science Second Edition McGraw-Hill New York Chicago San Francisco Lisbon London Madrid Mexico City Milan New Delhi San Juan Seoul Singapore Sydney Toronto Copyright © 2003 by The McGraw-Hill Companies, Inc. All rights reserved. Manufactured in the United States of America. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be repro- duced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. 0-07-141798-2 The material in this eBook also appears in the print version of this title: 0-07-141045-7 All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. 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Contents Preface ................................................................................................................. v Staff ...................................................................................................................... vi How to Use the Dictionary ........................................................................... vii Fields and Their Scope .................................................................................. ix Pronunciation Key ............................................................................................ x A-ZTerms .................................................................................................... 1-448 Appendix .................................................................................................. 449-468 Equivalents of commonly used units for the U.S. Customary System and the metric system .................................... 451 Conversion factors for the U.S. Customary System, metric system, and International System .............................. 452-455 Geologic column and scale of time .................................................... 456 Some historical volcanic eruptions ..................................................... 457 Principal regions of a standard earth model ..................................... 458 Physical properties of some common rocks ...................................... 458 Approximate concentration of ore elements in earth’s crust and in ores ............................................................................... 459 Soil orders .............................................................................................. 459 Elemental composition of earth’s crust based on igneous and sedimentary rock ........................................................ 460 World’s estimated water supply .......................................................... 460 Cloud classification based on air motion and associated physical characteristics ................................................. 461 Simplified classification of major igneous rocks on the basis of composition and texture ............................................ 462 Average chemical composition of igneous rocks (totals reduced to 100%) .................................................................. 463 Dimensions of some major lakes ........................................................ 464 Characteristics of some of the world’s major rivers ......................... 465 The 100 highest mountain peaks ........................................................ 466 Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. This page intentionally left blank. Preface The McGraw-Hill Dictionary of Earth Science provides a compendium of more than 10,000 terms that are central to the broad range of disciplines comprising earth science. The coverage in this Second Edition is focused on the areas of climatology, geochemistry, geodesy, geography, geology, geophysics, hydrol- ogy, meteorology, and oceanography, with new terms added and others revised as necessary. Earth science strives to understand the origins, evolution, and behavior of the earth in a broad context, including the place of the earth in the solar system and the universe. Much of the advances in earth science have resulted from the greatly improved ability to measure and analyze the complex interactions over time of the component parts of the earth, including the atmosphere, the biosphere, the hydrosphere, and the lithosphere. Thus, earth science is highly interdisciplinary, and an understanding of the terminology of the fields covered in this Dictionary is important for an appreciation of its literature and applications. All of the definitions are drawn from the McGraw-Hill Dictionary of Scientific and Technical Terms, Sixth Edition (2003). Each definition is classified according to the field with which it is primarily associated. The pronunciation of each term is provided along with synonyms, acronyms, and abbreviations where appropriate. A guide to the use of the Dictionary on pages vii-viii explains the alphabetical organization of terms, the format of the book, cross referencing, and how synonyms, variant spelling, abbreviations, and similar information are handled. The Pronunciation Key is provided on page x. The Appendix provides conversion tables for commonly used scientific units as well as a revised geologic time scale, periodic table, historical information, and useful listings of data from the varioius disclriplines of earth science. It is the editors’ hope that the Second Edition of the McGraw-Hill Dictionary of Earth Science will serve the needs of scientists, engineers, students, teachers, librarians, and writers for high-quality information, and that it will contribute to scientific literacy and communication. Mark D. Licker Publisher v Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. Staff Mark D. Licker, Publisher—Science Elizabeth Geller, Managing Editor Jonathan Weil, Senior Staff Editor David Blumel, Staff Editor Alyssa Rappaport, Staff Editor Charles Wagner, Digital Content Manager Renee Taylor, Editorial Assistant Roger Kasunic, Vice President—Editing, Design, and Production Joe Faulk, Editing Manager Frank Kotowski, Jr., Senior Editing Supervisor Ron Lane, Art Director Thomas G. Kowalczyk, Production Manager Pamela A. Pelton, Senior Production Supervisor Henry F. Beechhold, Pronunciation Editor Professor Emeritus of English Former Chairman, Linguistics Program The College of New Jersey Trenton, New Jersey vi Copyright 2003 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use. How to Use the Dictionary ALPHABETIZATION. The terms in the McGraw-Hill Dictionary of Earth Science, Second Edition, are alphabetized on a letter-by-letter basis; word spacing, hyphen, comma, solidus, and apostrophe in a term are ignored in the sequenc- ing. For example, an ordering of terms would be: aircraft icing ARFOR air discharge Argid air-mass analysis arid climate FORMAT. The basic format for a defining