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Let’s Look for · 3 Fossils are clues to the past that last a long time. A fossil might have been a fish or a shell, a bone or a footprint. The largest fossils together may make

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  • Let’s Look forLet’s Look forFossilsFossils

    Cover ©Photolibrary.com/David Cayless; 3 ©Photolibrary.com/David R Frazier; 4 ©Photolibrary.com/George Bernard; 5 ©Photolibrary.com/David Cayless; 6 ©Photolibrary.com/Sinclair Stammers; 7 ©Getty Images/Louie Psihoyos; 8 ©Photolibrary.com/Sinclair Stammers; 9 ©Photolibrary.com/Mauro Fermariello; 10 ©Photolibrary.com/Sinclair Stammers; 11 ©Getty Images; 12 ©Breck P. Kent; 13 ©Photolibrary.com/Gerard Soury; 14 ©Getty Images/Vanessa Berberion.

    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 10: 0-15-351436-1ISBN 13: 978-0-15-351436-4

    Ordering OptionsISBN 10: 0-15-351212-1 (Grade 2 Advanced Collection)ISBN 13: 978-0-15-351212-4 (Grade 2 Advanced Collection)ISBN 10: 0-15-358071-2 (package of 5)ISBN 13: 978-0-15-358071-0 (package of 5)

    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.

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    by Ainslie Mitchell

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    Fossils are clues to the past that lasta long time. A fossil might have beena fish or a shell, a bone or a footprint.The largest fossils together may makeup a whole dinosaur skeleton! Have youthought about how all these living thingscame to be fossils?

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    Bones that have become fossils aregreat clues. By fitting the bones together,scientists can work out the size and shapeof an animal. Even one fossil tooth thathas been separated from the other parts ofthe animal is a good clue. A scientist maybe able to figure out the size of a sharkfrom only one of its teeth.

    A shark tooth fossil

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    Fossil clues are how scientists can tellus all about dinosaurs that lived long ago.Of course, scientists have never seen anylive dinosaurs, but they have discoveredall sorts of things about them by studyingdinosaur fossils.

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    It is not common, but fossil eggs havebeen found still in their nest! Scientists candiscover a lot from the eggs. They can evenlook inside the eggs at the baby animalfossils.

    Dinosaur egg fossils

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    Some fossils are very small and canonly be seen under a microscope. They arecalled microfossils.

    Microfossils as seen under a microscope

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    If you are in a place where there arerocks, check them out! You never knowwhen you might find a fossil. Suddenly,you could be holding in your hand anexciting clue to one of the earth’s secrets!

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