World Book's LearningLadderson theWORLDBOOKwww.worldbook.comWorld Book,Inc.180 North LaSalle StreetSuite 900USAFor information about other World Book publications,visit our website at www.worldbook.com or call1-800-WORLDBK(967-5325).For information about sales to schools and libraries,call 1-800-975-3250 (United States):1-800-837.5365(Canada).2008 revised printing2008 World Book,Inc.All rights reserved.This book may not be reproduced in whole or in part inany form without prior written permission from the publisher.WORLD BOOK and the GLOBE DEVICE are registered trademarks or trademarks of World Book,Inc.Library of Congress Cataloging-in-Publication DataStaffExecutive CommitteeOn the move.President:Jim O'Rourkep.cm.-(World Book's learning ladders)Vice President and Editor in Chief:Poul A.KobasaSummary:"Introduction to modes ofVice President,Finance:Donald D.Kellertransportation using simple text,question andVice President,Marketing:Jean Linanswer format,illustrations,and photos.FeaturesVice President,International Sales:Maksim Rutenberginclude puzzles and games,fun focts,a resourceDirector,Human Resources:Bev Eckerlist,and an index"--Provided by publisher.Includes bibliographical references and index.Editorial1SBN978-0-7166-7728-4Director,Digital Print Content Development:Emily Kline1.Transportation--Miscellanea--JuvenileEditor,Digital Print Content Development:Kendra Muntzliterature.I.World Book,Inc.Senior Editor:Shawn BrennanTA1149.0582007Senior Editor:Dawn Krajcik629.04-dc22Manager,Indexing Services:David Pofelski2007018910Manager,Contracts Compliance (Rights Permissions):Loranne K.ShieldsWorld Book's Learning LaddersDigitalISBN978-0-7166-7725-3(set,hc.)Director,Digital Product Development:Erika MellerAlso available as:Graphics and DesignISBN 978-0-7166-7757-4 (e-book,Spindle)Senior Art Director:Tom EvansISBN978-0-7166-7758-1(e-book,EPUB3)Coordinator,Design Development and Production:Brenda B.TropinskiISBN978-0-7166-7759.8(e-book,PDF)Manufacturing/Pre-PressPrinted in China by Shenzhen Wing King TongManufacturing Manager:Anne FritzingerPaper Products Co,Ltd.,Shenzhen,GuangdongProofreader:Nathalie Strassheim1 Ith printing May 2017This edition is an adaptation of the Laddersseries published originally by T&N Children'sPublishing,Inc.,of Minnetonka,Minnesota.Photographic credits:Cover:Corbis Premium RF/Alamy;p4:Allsport UK Ltd;p5:TelegraphColour Library:p7:Quadrant Picture Library;p9 top:Robert Harding Picture Library;bottom:Imoges;p22:Tony Stone Imoges;p23:Stephen Strathdee,Shutterstock.