¿Caimán o cocodrilo? (Alligator or Crocodile?)

What causes sound? How does sound travel? Sound begins when matter vibrates. Without this vibration sound could not move and nothing would make any noise. Starting with tiny molecules, this book explains the main concepts of sound and furthers understanding through a series of easy-to-do experiments that will appeal to readers of all ages.

Tailored to the Language B syllabus, our full-colour IB coursebook, Mañana, contains everything you need for your two-year teaching course.

“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,...

Comparte el verdadero significado de la Navidad con tu pequeño. Con dulces historias, canciones, oraciones y escrituras combinadas con encantadoras ilustraciones de Precious Moments, Mi libro de historias bíblicas de Navidad ayuda a tu hijo a entender y celebrar las maravillas del nacimiento de Jesús. Este libro de cartón acolchado permite compartir fácilmente la historia de Jesús con los más pequeños, al tiempo que les enseña el amor de Dios. Precious Moments, Mi libro de historias bíblicas de Navidad: Es perfecto para niños de 2 a 5 años Incluye ilustraciones maravillosas y...