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¿Qué significa migrar? Descubra qué animales migran y por qué migran a través de fotografías detalladas y texto simple. What does it mean to migrate? Discover which animals migrate and why they migrate through detailed photographs and simple text.

Summarizes how water changes from a solid to a liquid and back again, and introduces related facts such as that water freezes at thirty-two degrees Fahrenheit and that ice floats.

Edición crítica con estudio introductorio y guía de lectura. 1967 fue un año mágico para Mario Vargas Llosa. Además de la publicación de Los cachorros, el peruano recibió el Premio Rómulo Gallegos, asistió en directo a la eclosión del boom junto con su nuevo amigo Gabriel García Márquez, participó en el XIII Congreso del Instituto Internacional de Literatura Iberoamericana en Caracas, mantuvo en agosto encuentros multitudinarios con escritores y numeroso público general que abarrotaba grandes salas, y en septiembre, para terminar el ciclo, su periplo culminó en varias...

Puedes hacer una bola de nieve. Puedes hacer un muñeco de nieve. ¿Pero sabes de dónde viene la nieve? ¡Averígualo en este libro sobre la nieve!

The need for speed is the motivating factor in this engaging, Spanish book. Readers learn the history of travel from the very slow to the supersonic and beyond, including everything in between. They learn and discover the factors that influence motion for all types of vehicles: land, air, and water alike. They also learn different ways to measure speed and read about energy uses for different vehicles. With greater speed comes greater risk. Readers learn how engineers are always seeking new and better ways to keep people safe as they travel faster and go farther.

The Hindenburg, the largest airship ever built and the pride of Nazi Germany, burst into flames over Lakehurst, New Jersey, in 1937. It swiftly fell from the sky and was incinerated. This incident is remembered as the most infamous airship accident, killing 36 people and sinking the dirigible transportation industry. Fascinated readers will explore why and how this giant hydrogen-filled ship was made and the reasons it may have been doomed to fail. They'll also learn conspiracy theories and surprising facts about the circumstances of the terrible disaster. Authentic photographs and thoughtful ...