Del renacuajo a la rana

What is matter and where can it be found? Everything in the world is made of matter, whether it is a solid, a liquid, or a gas. Important ideas about matter such as volume, mass, and how matter changes state are conveyed through a series of easy-to-do experiments.

Es un libro repleto de frases, poemas y textos escritos en los momentos más sentimentales. Hay páginas de amor y páginas de tristeza, pero todas y cada una de ellas expresan el sentimiento concreto que experimenté en el momento en el que lo escribí. Con este libro quiero que más gente se anime a escribir lo que siente y a mostrarlo al mundo, a mostrarse al mundo tal y como uno es. Tómate tu tiempo en leerlo.

Learn how to react when you see something wrong or dangerous with this relevant Spanish nonfiction book. Perfect for young readers, the book includes a fiction story related to the topic, a connected civics project, a glossary, useful text features, and engaging sidebars. This 28-page full-color Spanish book explains in an easy-to-understand way that students should talk to a trusted adult about things that make them uncomfortable or scared. It also covers serious subjects such as bullying and “stranger danger”, and includes an extension activity for grade 2. Perfect for the classroom,...

Deforestation, hunting and global warming have endangered countless species. The orangutan, okapi, giant panda and the blue whale are just some of the 30 species on the brink of extinction that are featured in this book. They need your help. The International Conservation Society illustrates how many of these species are left in the wild, and the latest status regarding their natural environment. You'll learn how you can aid endangered species and help sustain the ecosystems that give them life.