Photo Credits: Cover: Rykoff Collection/Corbis; p. 2: Brand X Pictures/Getty Images; p. 3: Branson Reynolds/Index Stock Imagery; p. 4: LLC, Fogstock/Index Stock Imagery; p. 5: C.C. Clockwood/Animals Animals/Earth Scenes; p. 6: Will & Deni McIntyre/Photo Researchers, Inc.; p. 7: Van D. Bucher/Photo Researchers, Inc.; p. 8: David Weintraub/ Photo Researchers, Inc.; p. 9: Jim Sugar/Corbis; p. 10: Dani Carlo Studio/Animals Animals/Earth Scenes; p. 11: Stephanie Lamberti/ABPL/Animals Animals/Earth Scenes. Copyright © by Harcourt, Inc. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Requests for permission to make copies of any part of the work should be addressed to School Permissions and Copyrights, Harcourt, Inc., 6277 Sea Harbor Drive, Orlando, Florida 32887-6777. Fax: 407-345-2418. HARCOURT and the Harcourt Logo are trademarks of Harcourt, Inc., registered in the United States of America and/or other jurisdictions. Printed in Mexico ISBN-13: 978-0-15-352333-5 ISBN-10: 0-15-352333-6 1 2 3 4 5 6 7 8 9 10 050 15 14 13 12 11 10 09 08 07 06 If you have received these materials as examination copies free of charge, Harcourt School Publishers retains title to the materials and they may not be resold. Resale of examination copies is strictly prohibited and is illegal Possession of this publication in print format does not entitle users to convert this publication, or any portion of it, into electronic format. CXECA08ARD207_OLR_U3.indd b 2/22/06 6:59:36 PM Earth Changes ..................................2 Wind and Rain ..................................4 Water ...............................................6 Plants ...............................................8 Things in the Air ...............................9 Weathering Causes Soil to Form .......10 Gl