La tumba tenebrosa

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. They’ll 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. Don’t worry, they’ll be happy to learn that (hopefully) we have millions of years left!

En un futuro próximo, los recursos energéticos de la Tierra han sufrido una radical transformación. Los suministros tradicionales casi se han agotado y el hombre se ha establecido en la Luna para extraer un combustible alternativo. Éste es el punto de partida de Límite, una novela dinámica, trepidante y cargada de suspense. Fruto de una rigurosa investigación científica, y con un marcado acento ecológico, Frank Schätzing invita al lector a derribar sus barreras mentales y a disfrutar sin límites de este thriller de rabiosa actualidad que no dejará a nadie indiferente.

Land has many different characteristics. It can be hilly, rocky, grassy, narrow, and dry. Or, it can be flat, smooth, sandy, wide, and wet! This Spanish book introduces students to the concept of landforms. With images that are easy to identify and clear, simple sentence structures, this science reader simplifies scientific concepts for young students as they improve their reading skills. A fun and easy science experiment and Your Turn! activity provide more in-depth opportunities for additional learning. Nonfiction text features include a glossary and an index. Engage students in learning...

The Concept Of The Cube Is Defined Through Interesting Text And Photos Displaying How Cubes Can Be Found Throughout Our World.