1、NASA/Science Photo Library/Photo Researchersi-01-LBI-861758 8/23/04 3:19 PM Page iThe Air Around YouThis satellite image showsHurricane Bonnie,whichstruck North Carolina in 1998.The storm was nearly 400 mileswide,with the highest recordedwind gust at 104 mph.Overalldamages were estimated in the$1.0
2、billion dollar range,andthree deaths were attributed tothe Category 3 storm.Send all inquiries to:Glencoe/McGraw-Hill8787 Orion PlaceColumbus,OH 43240-4027ISBN:0-07-861758-8Printed in the United States of America.2 3 4 5 6 7 8 9 10 027/043 09 08 07 06 05 04Copyright 2005 by The McGraw-Hill Companies
3、,Inc.All rights reserved.Except as permitted underthe United States Copyright Act,no part of this publication may be reproduced or distributed in anyform or by any means,or stored in a database or retrieval system,without prior written permission of the publisher.The National Geographic features wer
4、e designed and developed by the National Geographic SocietysEducation Division.Copyright National Geographic Society.The name“National Geographic Society”and the Yellow Border Rectangle are trademarks of the Society,and their use,without prior writtenpermission,is strictly prohibited.The“Science and
5、 Society”and the“Science and History”features that appear in this book weredesigned and developed by TIME School Publishing,a division of TIME Magazine.TIME and the redborder are trademarks of Time Inc.All rights reserved.NASA/Science Photo Library/Photo Researchersi-01-LBI-861758 8/23/04 3:20 PM Pa
6、ge iiCONTENTWilliam C.Keel,PhDDepartment of Physics andAstronomyUniversity of Alabama Tuscaloosa,ALMATHTeri Willard,EdDMathematics Curriculum WriterBelgrade,MTREADINGCarol A.Senf,PhDSchool of Literature,Communication,and CultureGeorgia Institute of TechnologyAtlanta,GASAFETYAileen Duc,PhDScience 8 T
7、eacherHendrick Middle School,Plano ISDPlano,TXACTIVITY TESTERS Nerma Coats HendersonPickerington Lakeview Jr.HighSchoolPickerington,OHMary Helen Mariscal-CholkaWilliam D.Slider Middle SchoolEl Paso,TXScience Kit and BorealLaboratoriesTonawanda,NYIiiiAuthorsSeries ConsultantsLois BurdetteGreen Bank E
8、lementary-MiddleSchoolGreen Bank,WVMarcia ChackanPine Crest SchoolBoca Raton,FLAnnette DUrso GarciaKearney Middle SchoolCommerce City,CONerma Coats HendersonPickerington Lakeview Jr.HighSchoolPickerington,OHMichael MansourBoard MemberNational Middle Level ScienceTeachers AssociationJohn Page Middle
9、SchoolMadison Heights,MISharon MitchellWilliam D.Slider Middle SchoolEl Paso,TXMark SailerPioneer Jr-Sr.High SchoolRoyal Center,IN Kate ZieglerDurant Road Middle School Raleigh,NC Series ReviewersEducation DivisionWashington,D.C.Susan Leach SnyderEarth Science Teacher,ConsultantJones Middle SchoolUp
10、per Arlington,OHDinah ZikeEducational ConsultantDinah-Might Activities,Inc.San Antonio,TXi-01-LBI-861758 8/23/04 3:20 PM Page iiiWhy do I need my science book?Have you ever been in class andnot understood all of what waspresented?Or,you understoodeverything in class,but at home,got stuck on how to a
11、nswer aquestion?Maybe you just wondered when you were evergoing to use this stuff?These next few pages are designed to help you understand everything your science book can be used for.besides a paperweight!Before You ReadChapter OpenerScience is occurring all around you,and the opening photo of each
12、 chapter will preview thescience you will be learning about.The ChapterPreview will give you an idea of what you will belearning about,and you can try the Launch Lab tohelp get your brain headed in the right direction.TheFoldables exercise is a fun way to keep you organized.Section OpenerChapters ar
13、e divided into two to foursections.The As You Read in the margin of the firstpage of each section will let you know what is mostimportant in the section.It is divided into four parts.What Youll Learn will tell you the major topics youwill be covering.Why Its Important will remind youwhy you are stud
14、ying this in the first place!TheReview Vocabulary word is a word you already know,either from your science studies or your prior knowl-edge.The New Vocabulary words are words that youneed to learn to understand this section.These wordswill be in boldfaced print and highlighted in thesection.Make a n
15、ote to yourself to recognize thesewords as you are reading the section.(bkgd)John Evans,(inset)NASA/Science Photo Library/Photo Researchersi-01-LBI-861758 8/23/04 3:20 PM Page ivAs You ReadHeadingsEach section has a titlein large red letters,and is furtherdivided into blue titles andsmall red titles
16、 at the begin-nings of some paragraphs.To help you study,make anoutline of the headings andsubheadings.MarginsIn the margins ofyour text,you will find many helpfulresources.The Science Online exercises andIntegrate activities help you explore the topicsyou are studying.MiniLabs reinforce the sci-ence concepts you have learned.Building SkillsYou also will find anApplying Math or Applying Science activityin each chapter.This gives you extra prac-tice using your new knowledge,and helpsprepare you f