Matemáticas en el cinturón de asteroides (Math in the Asteroid Belt)

Consolidates the Student's Book lessons with targeted practice, unit by unit Additional practice of reading, writing, speaking, listening and use of English skills Extensive grammar and vocabulary practice Complete practice exam in Unit 10 Designed for independent study at home and practice in class Audio for listening lessons available on the Student's App

Discusses the role of the gases surrounding Earth and the relationship of the atmosphere to weather. Presented in English and Spanish.

The sun is responsible for all life on Earth, but what exactly is it? Our star is an amazing force that can be as dangerous as it is important. From solar flares to the threat of blowing up altogether, the sun is one of the most interesting things in our solar system. Readers take a trip to the sun to see how it works and exactly what it is made of. Theyll learn about the life cycle of a star and see just how long we have until we have to find a new planet to call home. Dont worry, theyll be happy to learn that (hopefully) we have millions of years left!

Desde el origen de la humanidad se ha buscado la felicidad. Sabemos que existe, aunque a veces aparezca disfrazada, secuestrada por el dolor, el miedo, la depresión o el odio. Se llega a la conclusión de que, en el mundo de hoy, la mayoría de las personas nos consideramos generalmente felices la mayor parte del tiempo.