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What has a head, two tails, and shoots across the sky? A comet. Coming from the far edges of the solar system, most comets travel around the Sun, while meteors appear as flashing streaks of light in the night sky. Explore these amazing celestial wonders as they zip through space! This book looks at the difference between comets and meteors and their effects on Earth. The physical characteristics of each are identified in detail. This book won’t come crashing down! It’s filled with fun facts that give additional information on this exciting science topic. This book allows students to use...

In this Spanish title, learn causes of extinction and what problems extinction causes for animals, wildlife, and humans alike.

Continuando con la experiencia del equipo Aldebarán para la elaboración de proyectos de Religión, se presenta el “método Aldebarán XXI” para la nueva Secundaria. Textos, artículos de vigencia, historia... todo lo relacionado con la búsqueda de Dios, perfectamente adaptado para los estudiantes. Se pretende básicamente el acercamiento de los alumnos a los textos fundamentales de la fe católica, y mostrarles los criterios clave de interpretación de las fuentes del cristianismo. A través de las distintas Unidades, el alumno valorará la vigencia e importancia del mensaje cristiano, ...

“Dino” Don Lessem brings readers face-to-face with various dinosaur species, detailing their habitats, way of life and how they became extinct. An acclaimed dinosaur expert, Don Lessem has written more than 30 children’s books, writes a popular dinosaur column in Highlights magazine, and was an adviser for Jurassic Park. Take a trip through dinosaur time to meet these horned dinosaurs face-to-face: Torosaurus had the biggest skull of any animal ever! Pentaceratops had five sharp horns on its head! Styracosaurus was as big as an ice cream truck! Plus, you'll get to know Centrosaurus,...