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NATIONAL GEOGRAPHIC YOUNG EXPLORER

(ISSN 1930-8116) is published seven times during the school year—September, October, November–December, January–February, March, April, May—by National Geographic Society, 1145 17th Street NW, Washington, D.C. 20036. Postmaster: Please send address changes to Attn: Young Explorer Magazine, National Geographic Society, PO Box 291875, Kettering, OH 45429. Periodical postage paid at Washington, D.C., and additional mailing offices.

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DIGITAL CREDITS | COVER: RAIMUND LINKE/MAURITIUS IMAGES/AGE FOTOSTOCK. TOC: (BACKGROUND) DSZC/E+/GETTY IMAGES; (OTTER) GERARD LACZ/MAURITIUS/SUPERSTOCK; (VOLCANO VIDEO) MARC SZEGLAT/MOMENT VIDEO RF/GETTY IMAGES; (HANDS & PLANT) YULIIA D/SHUTTERSTOCK. MEET A RIVER OTTER: (OTTER LOOKING OUT OF DEN) GERARD LACZ/MAURITIUS/SUPERSTOCK; (OTTER STANDING) TBKMEDIA.DE/ALAMY STOCK PHOTO; (OTTER RUNNING) AMBLING IMAGES/ALAMY STOCK PHOTO; (OTTER DIVING) NATURE PICTURE LIBRARY/ALAMY STOCK PHOTO; (OTTER EATING VIDEO) SJO/CREATAS VIDEO+/GETTY IMAGES PLUS; (0TTERS PLAYING VIDEO) NATTANAN726/CREATAS VIDEO+/GETTY IMAGES PLUS; (OTTER SLEEPING) ARCO/C BRAUN/ARCO IMAGES/AGE FOTOSTOCK. HOT ROCKS: (VOLCANO VIDEO)MARC SZAGLAT/MOMENT VIDEO RF/GETTY IMAGES; (ALL IMAGES) CARSTEN PETER/NATIONAL GEOGRAPHIC IMAGE COLLECTION; (LIQUID LAVA FLOW VIDEO) JOSIAH HUNT/CREATAS VIDEO+/GETTY IMAGES PLUS; (LAVA FLOW WITH ROCKS VIDEO) SCIENCE PHOTO LIBRARY/PHOTOLIBRARY VIDEO/GETTY IMAGES. SOLID OR LIQUID?: (ICE CUBES) LYUDMYIA ISHCHENKO/SHUTTERSTOCK; (MILK) STOCKAKIA/SHUTTERSTOCK; (APPLE) STUDIO BARCELONA/SHUTTERSTOCK; (POND) EDUARD RADU/SHUTTERSTOCK; (ROCKS) LEMBERG VECTOR STUDIO/SHUTTERSTOCK; (JUICE) SPREADTHESIGN/SHUTTERSTOCK. GREAT GIFTS FOR EARTH: (HANDS & PLANT) YULIIA D/SHUTTERSTOCK; (LEAF ILLUSTRATIONS) VIKIVECTOR/SHUTTERSTOCK; (PLAYGROUND & TRASH) INDEPENDENT PICTURE SERVICE/ALAMY STOCK PHOTO; (CHIPMUNK) DEBRA BEHR/ALAMY STOCK PHOTO; (KIDS DRAWING) FSTOP123/E+/GETTY IMAGES; (GIRLS & WATER BOTTLES) SOLSTOCK/E+/GETTY IMAGES; (GIRL & LUNCHBOX) PIXEL-SHOT/ALAMY STOCK PHOTO; (KIDS WALKING ON LOG) DIRK KITTELBERGER/WESTEND61/AGE FOTOSTOCK; (CHILD & BOOGIE BOARD) SAM EDWARDS/CAIA IMAGE/AGE FOTOSTOCK; (KIDS & KITE) COMSTOCK/STOCKBYTE/GETTY IMAGES. WORDS TO EXPLORE: (RIVER) JAROS/SHUTTERSTOCK; (GLASS OF WATER) SCIENCE PHOTO/SHUTTERSTOCK; (LAVA) CARSTON PETER/NATIONAL GEOGRAPHIC IMAGE COLLECTION; (STONE) CHENGYU/SHUTTERSTOCK. THE END PHOTO: UNDERWORLD/SHUTTERSTOCK.