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COVER: FRANCO TEMPESTA. TOC: (BACKGROUND) JASMINA007/E+/GETTY IMAGES; (DINOSAURS) FRANCO TEMPESTA; (VOLCANO) MORLEY READ/PHOTOLIBRARY/GETTY IMAGES; (WETLAND) JUAN CARLOS MUNOZ/AGE PHOTOSTOCK/SUPERSTOCK. WHAT DID DINOSAURS EAT: (ALL ILLUSTRATIONS) FRANCO TEMPESTA. VOLCANOES: (VIDEO) BBC NATURAL HISTORY/BBC CREATIVE/GETTY IMAGES; (VOLCANO WITH RED LAVA) MORLEY READ/PHOTOLIBRARY/GETTY IMAGES; (NIGHT VOLCANO VIDEO) MARC SZEGLAT/MOMENT VIDEO RF/GETTY IMAGES; (INSET) G. BRAD LEWIS/AURORA/GETTY IMAGES; (LAVA VIDEO) SCIENCE PHOTO LIBRARY/PHOTOLIBRARY VIDEO/GETTY IMAGES; (VOLCANO IMAGE) PETE NIESEN SELECT IMAGES/ALAMY STOCK PHOTO; (VOLCANO ILLUSTRATIONS) DAVID A. HARDY/SCIENCE SOURCE. LAND AND WATER POSTER: PRECISION GRAPHICS. A WONDERFUL WETLAND: (WETLAND) JUAN CARLOS MUNOZ/AGE PHOTOSTOCK/SUPERSTOCK; (INSET) RACHEL SUSSMAN/ NATIONAL GEOGRAPHIC CREATIVE; (WETLAND VIDEO) MARTINHARVEY/CREATAS VIDEO+/GETTY IMAGES PLUS; (BIRDS) CHRISTIAN HEINRICH/GETTY IMAGES; (WATERBUCK) 2630BEN/ISTOCK/GETTY IMAGES PLUS; (HIPPO VIDEO) SLAVEMOTION/CREATAS VIDEO/GETTY IMAGES; (CROCODILE INSET) BERND BIEDER / IMAGEBROKER / SUPERSTOCK; (ZEBRAS) ROBERT HARDING/SUPERSTOCK; (LIONS) BEVERLY JOUBERT/NATIONAL GEOGRAPHIC CREATIVE; (ADJANY WITH NET) PETE MULLER/NATIONAL GEOGRAPHIC CREATIVE; (ADJANY PINK TOP BOTH)) MAURO SERGIO/NATIONAL GEOGRAPHIC CREATIVE; (ADJANY WITH SNAKES) STEVE BOYES/NATIONAL GEOGRAPHIC CREATIVE; (ADJANY VIDEO) NATIONAL GEOGRAPHIC CREATIVE. EXPLORER MAPS: STEVE MCCRACKEN. THE END IMAGE: FRANCO TEMPESTA