Obedecer las reglas

¿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.

A New York Times best-seller and winner of the ABBY Award features lavish illustrations of Native American settings and shares Chief Seattle's environmental message for "helping preserve what is being lost."

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.

All Spanish Prepositions This book is intended to explain how to use the 23 prepositions existing in the Spanish language to students of Spanish as a second language or to Spanish native speakers who want to acquire, refresh or improve their knowledge on this topic. Studying prepositions in any language is one of the hardest tasks because there are several rules to follow as well as some exceptions. The various rule categories are explained for each preposition along with numerous examples. These examples cover different contexts to give the reader multiple usage options of the language...

¿Quieres saber cómo eran las peleas de gladiadores, cómo se construían los acueductos o qué significan las palabras "Mare Nostrum"? Pues estás de suerte... ¡Hoy, los chicos de la Hispania del Imperio Romano serán tus guías particulares! Te llevarán por las calles de sus ciudades y te mostrarán el gran circo, los talleres de los artesanos, los mercados, los templos y mucho más. ¡Juntos aprenderéis cómo era un día en la vida de esta increíble civilización de la antigüedad! Escrito por Pedro Pérez, profesor y creador del canal de YouTube "El cubil de Peter", donde divulga...