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PhotoDisc Electricity and Magnetism Iron filings cluster around the north and south poles of a bar magnet because of magnetic force. Magnetic force is exerted through a magnetic field which is outlined by the iron filings. This field is caused by negatively charged electrons spinning in the atoms. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved. Except as permitted under the United States Copyright Act no part of this publication may be reproduced or distributed in any form or by any means or stored in a database or retrieval system without prior written permission of the publisher. The National Geographic features were designed and developed by the National Geographic Society’s Education 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 written permission is strictly prohibited. The “Science and Society” and the “Science and History” features that appear in this book were designed and developed by TIME School Publishing a division of TIME Magazine. TIME and the red border are trademarks of Time Inc. All rights reserved. Send all inquiries to: Glencoe McGraw-Hill 8787 Orion Place Columbus OH 43240-4027 ISBN: 0-07-861773-1 Printed in the United States of America 2 3 4 5 6 7 8 9 10 027 111 09 08 07 06 05 04 Authors Education Division Washington D.C. Cathy Ezrailson Science Department Head Academy for Science and Health Professions Conroe TX Margaret K. Zorn Science Writer Yorktown VA Dinah Zike Educational Consultant Dinah-Might Activities Inc. San Antonio TX Jack Cooper Ennis High School Ennis TX Carl Zorn PhD Staff Scientist Jefferson Laboratory Newport News VA Math Michael Hopper DEng Manager of Aircraft Certification L-3 Communications Greenville TX Series Consultants Reading Barry Barto Special Education Teacher John F. Kennedy Elementary Manistee MI Rachel Swaters-Kissinger Science Teacher John Boise Middle School Warsaw MO Safety Sandra West PhD Department of Biology Texas State University-San Marcos San Marcos TX Activity Testers Nerma Coats Henderson Pickerington Lakeview Jr. High School Pickerington OH Mary Helen Mariscal-Cholka William D. Slider Middle School El Paso TX Science Kit and Boreal Laboratories Tonawanda NY Series Reviewers Deidre Adams West Vigo Middle School West Terre Haute IN Karen Curry East Wake Middle School Raleigh NC Anthony J. DiSipio Jr. 8th Grade Science Octorana Middle School Atglen PA George Gabb Great Bridge Middle School Chesapeake Public Schools Chesapeake VA Why do I need my science book? Have you ever been in class and not understood all of what was presented? Or, you understood everything in class but got stuck on how to answer a question at home? Maybe you just wondered when you were ever going 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 Read Chapter Opener Science is occurring all around you, and the opening photo of each chapter will preview the science you will be learning about. The Chapter Preview will give you an idea of what you will be learning about, and you can try the Launch Lab to help get your brain headed in the right direction. The Foldables exercise is a fun way to keep you organized. Section Opener Chapters are divided into two to four sections. The As You Read in the margin of the first page of each section will let you know what is most important in the section. It is divided into four parts: What You’ll Learn, Why It’s Important, Review Vocabulary word and New Vocabulary words. Make a note to yourself to recognize these words as you are reading the section. As You Read Headings Each section has a title in large red letters, and is further divided into blue titles and small red titles at the beginnings of some paragraphs. To help you study make an outline of the headings and subheadings. Margins In the margins of your text, you will find many helpful resources: Science Online exercises and Integrate activities help you explore the topics you are studying. MiniLabs reinforce the science concepts you have learned. Building Skills You also will find an Applying Math or Applying Science activity in each chapter. This gives you extra practice using your new knowledge, and helps prepare you for standardized tests. Student Resources At the end of the book you will find Student Resources to help you throughout your studies: Science Technology and Math Skill Handbooks, English Spanish Glossary, Index. Also use your Foldables as a resource. It will help you organize information and review before a test. In Class Remember, you can always ask your teacher to explain anything you don’t understand. Science Vocabulary Make the following Foldable to help you understand the vocabulary terms in this chapter. STEP 1 Fold a vertical sheet of notebook paper from side to side. STEP 2 Cut along every third line of only the top layer to form tabs. STEP 3 Label each tab with a vocabulary word from the chapter. Build Vocabulary As you read the chapter, list the vocabulary words on the tabs. As you learn the definitions write them under the tab for each vocabulary word. Look For At the beginning of every section. In Lab Working in the laboratory is one of the best ways to understand the concepts you are studying. Your book will be your guide through your laboratory experiences and help you begin to think like a scientist. In it, you not only find the steps necessary to follow the investigations but also find helpful tips to make the most of your time. Each lab provides you with a Real-World Question to remind you that science is something you use every day, not just in class. This may lead to many more questions about how things happen in your world. Remember experiments do not always produce the result you expect. Scientists have made many discoveries based on investigations with unexpected results. You can try the experiment again to make sure your results were accurate or perhaps form a new hypothesis to test. Keeping a Science Journal is how scientists keep accurate records of observations and data. In your journal, you also write any questions that may arise during your investigation. This is a great method of reminding yourself to find the answers later. Before a Test Admit it! You don’t like to take tests! However, there are ways to review that make them less painful. Your book will help you be more successful taking tests if you use the resources provided to you. Review all of the New Vocabulary words and be sure you understand their definitions. Review the notes you’ve taken on your Foldables in class and in lab. Write down any question that you still need answered. Review the Summaries and Self Check questions at the end of each section. Study the concepts presented in the chapter by reading the Study Guide and answering the questions in the Chapter Review. Look For Reading Checks and caption questions throughout the text. the Summaries and Self Check questions at the end of each section. the Study Guide and Review at the end of each chapter. the Standardized Test Practice after each chapter. Let’s Get Started To help you find the information you need quickly, use the Scavenger Hunt below to learn where things are located in Chapter 1. What is the title of this chapter? What will you learn in Section 1? Sometimes you may ask, “Why am I learning this?” State a reason why the concepts from Section 2 are important. What is the main topic presented in Section 2? How many reading checks are in Section 1? What is the Web address where you can find extra information? What is the main heading above the sixth paragraph in Section 2? There is an integration with another subject mentioned in one of the margins of the chapter. What subject is it? List the new vocabulary words presented in Section 2. List the safety symbols presented in the first Lab. Where would you find a Self Check to be sure you understand the section? Suppose you’re doing the Self Check and have a question about concept mapping. Where could you find help? On what pages are the Chapter Study Guide and Chapter Review? Look in the Table of Contents to find out on which page Section 2 of the chapter begins. You complete the Chapter Review to study for your chapter test. Where could you find another quiz for more practice? Teacher Advisory Board The Teacher Advisory Board gave the editorial staff and design team feedback on the content and design of the Student Edition. They provided valuable input in the development of the 2005 edition of Glencoe Science. 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