Extended ebook content for Cracking the AP Environmental Science Exam, 2012 Edition

Excerpted from Cracking the AP Environmental Science Exam, 2012 Edition by Angela Marrow, Tim Ligget, and the Staff of the Princeton Review. Copyright © 2011 by the Princeton Review, Inc. Excerpted by permission of the Princeton Review imprint of the Random House Children's Group, a division of Random House, Inc. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.