Los estados de la materia — Los gases

How many elephants? How many giraffes? Count the animals of the Serengeti! Early readers will learn cardinal numbers and counting by fives with this Spanish book for kids. With bright images and simple text, this full-color book develops students' math and reading skills. The Math Talk questions build fluency and comprehension of basic math concepts. Perfect for shared or guided reading, this nonfiction kids book is ideal for kindergarten and ages 4-6.

¿Por qué es importante no malgastar el agua? ¿Qué podemos hacer nosotros para contribuir al ahorro? Acompaña a los protagonistas de esta historia y encontrarás las respuestas a esas preguntas. El libro incluye notas para padres y profesores, así como actividades lúdicas que ayudarán a reforzar su contenido.

"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 feathered dinosaurs face to face: The Caudipteryx had feathered arms and a tail that looked like a pom-pom! The Sinovenator may have used colorful feathers to attract a mate! The Microraptor may have used its feathers to glide...

Think about your favorite computer program or smartphone app. Do you know how it was made? In this book, readers will learn about the work that goes into creating the software we use every day. Exciting fact boxes and sidebars add depth to the text with additional information about the software design process. Readers will gain an understanding of the various steps of the software development life cycle. They'll also be introduced to famous software architects and STEM concepts from the Next Generation Science Standards throughout the text.