Lewis y Clark y la compra de la Luisiana (Lewis and Clark and Exploring the Louisiana Purchase)

Readers may never expect that they might free fall to Earth, but if they have ever dived into a pool, that's exactly what they've done. This book shows readers how Newton's three laws of motion affect divers, skydivers, and mountain climbers' movements. Readers discover who uses gravity, and who works against it, and all other forces that contribute to a successful dive or climb. After reading this book, readers can decide if they will ever be interested in engaging in one of these extreme sports.

What has lots of tiny eyes, a hard shiny body, and huge black claws? If you guessed an emperor scorpion, you're right! This book introduces early readers to a mystery animal by describing its features, one by one, using short simple sentences and eye-popping full-color photos. At the end of the book, the secret animal is revealed across a colorful, two-page spread. Young children will love showing off their beginning reading skills as they learn about this dazzling collection of wild and wonderful zoo animals--one clue at a time! Fast facts and habitat maps at the end of the book provide...

A koala rests comfortably in an Australian eucalyptus forest, penguin families gather on icebergs of Antarctica, an alligator protects her young in its mouth, a hippopotamus teaches her baby the art of bathing, and an elf owl peeks out of its cactus nest. These captivating images, taken by some of the world's leading wildlife photographers, introduce young children to similarities that exist between the animal world and their own. Photographs of animal habitats from all over the world teach young readers that all living creatures live in special places they call home. And by seeing animals...

An elementary introduction to the workings of the human body, the skeleton, skin, circulation, and nervous system.