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"Interactive Student Edition", Level Green These ocean cliffs on the Victoria coast in Australia are called the Twelve Apostles. They form a background for wild horses running through a field. The inset photo is a model of an aspirin molecule. These elements represent Earth, life, and physical sciences, respectively. Copyright (c) 2008 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 (c) 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: 978-0-07-877808-7 MHID: 0-07-877808-5 Printed in the United States of America. 1 2 3 4 5 6 7 8 9 10 079 043 09 08 07 Contents In Brief: Earth's Materials. Chapter 1 The Nature of Science. Chapter 2 Minerals. Chapter 3 Rocks. Earth's Atmosphere and Beyond. Chapter 4 Atmosphere. Chapter 5 Weather. Chapter 6 Climate. Chapter 7 Earth in Space. The Basis of Life. Chapter 8 Life's Structure and Classification. Chapter 9 Cell Processes. Chapter 10 Cell Reproduction. Chapter 11 Heredity. Chapter 12 Adaptations Over Time. Human Body Systems. Chapter 13 Circulation and Immunity. Chapter 14 Digestion, Respiration, and Excretion. Chapter 15 Support, Movement, and Responses. Chapter 16 Regulation and Reproduction. The Interdependence of Life. Chapter 17 Plants. Chapter 18 Interactions of Living Things. Chapter 19 Conserving Resources. Matter and Energy. Chapter 20 Properties and Changes of Matter. Chapter 21 Substances, Mixtures, and Solubility. Chapter 22 States of Matter. Chapter 23 Newton's Laws of Motion. Chapter 24 Energy and Energy Resources. 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