MindTap for Petersen/Sack/Gabler's Physical Geography, 12th Edition, helps you learn on your terms. A reader-friendly presentation, filled compelling illustrations and the latest updates, defines physical geography and highlights the reciprocal relationship between people and Earth's natural environment. MOBILE APP Take advantage of the Cengage Mobile App to learn on your terms. Read or listen to textbooks and study with the aid of instructor notifications, flashcards and practice quizzes. TRACK PROGRESS Track your scores and stay motivated toward your goals. Whether you have more work to do or are ahead of the curve, you'll know where you need to focus your efforts. And the MindTap Green Dot will charge your confidence along the way. NOTES AND FLASHCARDS No one knows what works for you better than you. Highlight key text, add notes and create custom flashcards. When it's time to study, everything you've flagged or noted can be gathered into a guide you can organize.