Exploremos los minerales de la Tierra (Exploring Earth's Minerals)

When winter hits, many people in colder climates spend most of their time indoors. But what do wild animals do? Some animals spend winters hibernating. Beginning readers will learn what hibernation is, why some animals hibernate and others don't, and how hibernating animals prepare for their long sleep. Full-color photographs grab readers' attention and allow them to draw connections to the narrative. Readers will love learning about this mysterious, restful time in some animals' lives.

The rock cycle has been taking place for millions of years. However, geologists have only known about this phenomenon for about 300 years. Young terrestrial explorers are introduced to different types of rocks, where in the cycle these rocks fit, and where in Earth's layers each step takes place. Fact boxes provide readers with fun additional information. A diagram helps readers make sense of the new information they're learning.

Explains the basic science of flight, the problems of getting vehicles into the air, different types of engines, and aircraft design, and includes instructions for making aircraft models.

Con Pristi, el niño descubre la importancia de conocerse, con sus fuerzas y sus límites, y de construir un concepto de sí mismo que será la base de su identidad y de su deseo de realización.

¿Cuánto sabes sobre pedos? Descúbrelo todo sobre el gas más divertido de la historia en esta completa enciclopedia ilustrada. ¿Sabías que se necesitarían nueve pedos de cada persona que habita en la Tierra para impulsar una bomba atómica? ¿Que los pedos de peces casi desencadenan una guerra contra Rusia? ¿Que los pedos de las mujeres huelen peor que los de los hombres? ¡Pues está todo en este libro! ¿Sabías que inhalar pedos es saludable, pero que hay gente que se tira pedos una vez muerta? ¿Sabías que podrías trabajar como oledor de pedos profesional? ¿Que los pedos son...

One of the most popular narrators of his time, Arthur Conan Doyle, was a visionary man with attitudes which were far ahead of his time. In this book we will know in depth his biography, his work, beyond the creation of the illustrious Sherlock Holmes, and his spiritualistic inquisitiveness.