Natural History Photography;
675 (TR) Breck P. Kent Natural History Photography, (TL) Jan Butchofsky/Corbis, (CL) Jim Sugar/Corbis, (TC) Galyna Andrushko/ Fotolia;
676 (TR) Pete Turner/Getty Images, (BL) Science Source/Photo Researchers, Inc.;
677 (TL) Martin Land/Science Photo Library/Photo Researchers, Inc.;
678 (T) Science Source/Photo Researchers, Inc.;
680 (BR) Bettmann/Corbis, (BL) Harry Taylor/©DK Images, (C) Pascal Goetgheluck/Photo Researchers, Inc., (CR) Time & Life Pictures/Getty Images;
681 (CC) NASA, (CR) Roger Harris/Photo Researchers, Inc., (BL) Science Museum, London/DK Images;
683 (TR) elxeneize/Shutterstock;
684 (TR) Pete Turner/Getty Images, Suzanne Plunkett/©AP Images;
685 (TR) David Parker/Science Photo Library/ Photo Researchers, Inc., (B) Gunter Marx/Alamy;
688 (TR) Joseph Sohm/Visions of America/Photo Researchers, Inc., (BR) Seismogram ©UC Regents, UC Berkeley Seismological Laboratory;
690 (B) David Weintraub/Photo Researchers, Inc., (TR) Pete Turner/Getty Images;
692 (T) Breck P. Kent Natural History Photography, (B) G. Brad Lewis/Getty Images;
694 (BC) Francesca Yorke/©DK Images, (C) Jim Sugar, (BR) Mike Severns/©DK Images, (BL) Rob Reichenfeld/©DK Images;
695 (TR) Colin Keates/©DK Images, (TC) Dave King/©DK Images, (T) DK Images;
696 (T) ©Thomas Wiewandt;
702 ©Thomas Wiewandt;
704 (T) ©Thomas Wiewandt, (C, B) Planetary Visions Ltd/Photo Researchers, Inc.;
707 (TR) Samuel R. Maglione/Photo Researchers, Inc.;
708 (T) ©Eberhard Hummel/AGE Fotostock;
709 (T) ©Thomas Wiewandt, (B) Breck P. Kent Natural History Photography;
710 (T,) William H. Mullins/Photo Researchers, Inc.;
711 (T) ©Egmont Strigl/PhotoLibrary Group, Inc., (BC) David Lyons/©DK Images, (TR) Egmont Strigl/Photolibrary Group, Inc., (CR) Martin Miller/Photo Researchers, Inc.;
713 (T) ©Thomas Wiewandt, (B) Larry Miller/ Photo Researchers, Inc.;
716 (B) vyskoczilova/Shutterstock, (B) blickwinkel/ Alamy Images, (CL) Martin & Marli Miller, (T) James Steinberg/Science Source;
717 (TR) Bruce Roberts/Photo Researchers, Inc.;
718 (T) ©Melvyn P. Lawes; Papilio/Corbis;
719 (T) ©Thomas Wiewandt, (BR) Bernhard Edmaier/Photo Researchers, Inc.;
720 (B) John Buttenkant/Photo Researchers, Inc.;
721 (T,) ©MERVYN REES/Alamy Images;
722 (TR) BRUCE COLEMAN INC./Alamy Images;
723 (B) ©Radius Images/Alamy;
724 (T) Mark J. Terril/©AP Images;
725 (B) ©Jim Corwin/Photo Researchers, Inc., (T) ©Thomas Wiewandt;
727 (B) ©Joel Arem/Photo Researchers, Inc.;
728 (BL) Christophe Boisvieux/Corbis, (BR) George Gerster/Photo Researchers, Inc., (BC) Jason Hawkes/Corbis;
730 (TR) frantisek hojdysz/Fotolia, (B) Mike Dunning/©DK Images;
731 (TL) Amos Nachoum/Corbis, (CR) Science Source/Photo Researchers, Inc.;
732 (T) ©Thomas Wiewandt, (B) Andy/Fotolia;
735 (R) ©The Natural History Museum, London;
738 (TR) ©The Natural History Museum, London, (TL) John Sibbick;
744 Stocktrek/Corbis;
746 (CL) ©AP Images, (B) Palenque/Fotolia, (TR) Stocktrek/Corbis;
749 (L) ©Paul Seheult/Corbis, (TR) Karl Shone/©DK Images;
751 N. Rosing/Okapia/Photo Researchers, Inc.;
752 (Bkgrd) Liane Cary/AGE Fotostock, (TR) Stocktrek/Corbis;
755 (BR) Corbis, (TR) Stocktrek/Corbis;
756 (TR) NASA;
758 (BL) Peter Christopher/Masterfile Corporation;
760 (BL) Karl Shone/©DK Images, (TR) Stocktrek/Corbis;
761 (B) ©Ashway/Alamy Images, (T) ©John Warburton-Lee Photography/Alamy Images;
762 (TL) ©Martin Cameron/Alamy Images, (CL) Adam Jones/Photo Researchers, Inc., (BL) David R. Frazier/Photo Researchers, Inc., (Bkgrd) redbrickstock/Alamy;
763 (TR) ©blickwinkel/Alamy Images, (C, B) ©Chris Cheadle/Alamy Images, (TL) Trevor McDonald/Photo Researchers, Inc.;
764 (TL) Kennan Ward/Corbis;
765 (BR) Carl Roessler/Getty Images, (TR) Stocktrek/Corbis;
769 (TR) Science Source/Photo Researchers, Inc.;
770 (L) Weatherstock(r);
771 Comstock/Thinkstock;
772 (BC) NOAA, (B) NOAA/©AP Images;
773 (BL) ©Matthew Cavanaugh/epa/Corbis;
774 ©Mark A. Schneider/Photo Researchers, Inc., (TR) Stocktrek/Corbis;
775 (TR) Simon Fraser/Photo Researchers, Inc.;
776 (TCL) Weather Graphics Courtesy of AccuWeather, Inc.;
777 David R. Frazier Photolibrary, Inc./Photo Researchers, Inc.;
778 (TR) Stocktrek/Corbis;
780 (TL) Daryl Balfour/Getty Images;
781 (TR) Martin & Marli Miller, Photo Researchers, Inc.;
782 Deborah Davis/Getty Images, weareadventurers/iStockphoto;
785 Pgiam/iStockphoto;
786 Jeff Gentner/©AP Images;
792 Science Photo Library/Photo Researchers, Inc.;
794 (TR) Science Photo Library/Photo Researchers, Inc., (B) cduschinger/ Fotolia;
795 (TR) Bettmann/Corbis, (TL) Stapleton Collection/Corbis;
798 (B) NASA, (TL) NASA Jet Propulsion Laboratory/©AP Images, (BL) Science Source/ Photo Researchers, Inc., (T) Stocktrek Images/Getty Images;
799 (C) ©DK Images, (TR) GRIN/NASA;
800 (B) ©AP Images, (TR) Science Photo Library/ Photo Researchers, Inc.;
801 (B) Corbis, (T) Brad Thompson/Fotolia;
804 (BR) Frank Zullo/Photo Researchers, Inc., (T) Science Photo Library/Photo Researchers, Inc.;
806 (T) NASA;
807 (TR) Science Photo Library/Photo Researchers, Inc., (BR) Victor Habbick Visions/Photo Researchers, Inc.;
808 (BL) U.S. Geological Survey/Science Source;
809 (B) ©Science Source/Photo Researchers, Inc., (T, C) Science Source;
810 (BC) ©Bettmann/Corbis, (CR, BL) NASA, (BL) Ria Novosti/Science Photo Library/Photo Researchers, Inc.;
811 (C) ©DK Images, (BR) Marshall Space Flight Center/NASA Image Exchange, (CR) NASA;
812 (B) European Space Agency/Photo Researchers, Inc., (BL) JPL-Caltech/Cornell/NMMNH/NASA, (TR) Photo Researchers, Inc., (TL) Stocktrek Images, Inc./Alamy (TC) RGB Ventures LLC dba SuperStock/Alamy;
813 (B) Science Source, (T) Agencia el Universal/El Universal de Mexico/Newscom;
814 (BL) Photo Researchers, Inc., (TR) Science Photo Library/Photo Researchers, Inc.;
815 (BR) James Stevenson/©DK Images;
816 (B) D. Ducros/Photo Researchers, Inc., (C) NASA, (TL) NASA/Science Photo Library/Photo Researchers, Inc.;
818 (TL) Bettmann/Corbis, (BL) NASA;
819 (CR) DK Images;
820 (BL) ©DK Images, (T) Raymond Turvey/©DK Images;
821 (BL) ©Charles O'Rear/Corbis, (CR) Alan Keohane/©DK Images, (TCL) Getty Images;
822 (TR) Science Photo Library/Photo Researchers, Inc.;
824 (TL) Corbis;
830 (C) David Malin/Anglo-Australian Observatory;
832 (TR) David Malin/Anglo-Australian Observatory, (B) Reed Kaestner/Corbis;
833 (B) Science Source;
835 (TR) David Nunuk/Science Photo Library/Photo Researchers, Inc.;
836 Science Source/ Photo Researchers, Inc.;
837 (T) ©Roger Ressmeyer/Skylab/NRL/NASA/Corbis, Science Source/Photo Researchers, Inc.;
838 (TR, B) David Malin/Anglo-Australian Observatory;
840 (BL) Eckhard Slawik/Photo Researchers, Inc.;
841 (BR) ©Galaxy Picture Library, (T) Sean Pavone/Shutterstock;
844 (TR) David Malin/Anglo-Australian Observatory, (B) Leland Bobbé/Corbis;
845 (TR) David Malin/Anglo-Australian Observatory;
847 (TR) Corbis, (CR) European Southern Observatory/Science Photo Library/Photo Researchers, Inc.;
849 (TR) NASA Image Exchange;
850 (CL) ©Scala/Art Resource, NY, (TR) David Malin/Anglo-Australian Observatory;
851 (BR) David Malin/Anglo-Australian Observatory, (CR) Stattmayer/Getty Images;
852 (CL, BL) David Malin/Anglo-Australian Observatory, (B) Eckhard Slawik/Photo Researchers, Inc., (CL) Royal Observatory/Science Photo Library/Photo Researchers, Inc.;
854 (BL) Hubble Heritage Team/NASA, (T) NASA Image Exchange;
856 (TR) David Malin/Anglo-Australian Observatory;
858 (B) NASA;
866 Rosenfeld Images Ltd./Photo Researchers, Inc.;
868 (BL) Richard Megna/Fundamental Photographs;
870 Jerry Howard/Positive Images;
871 blickwinkel/Alamy;
885 (BR) Barnabas Kindersley/©DK Images;
889 (BR) Lonely Planet Images;
890 (BL) Hutchison Picture Library;
891 (BR) Rob Elliott/ AFP/Getty Images;
892 (B) Mathew Connolly/Shutterstock, (T) U.S. Geological Survey;
902 (T, B) Griffith Observatory;
903 (T, B) Griffith Observatory.