Abanico Nueva edición - Libro del alumno + CD

"Some things are so huge or so old that it's hard to wrap your mind around them. But what if we took these big, hard-to-imagine objects and events and compared them to things we can see, feel and touch? Instantly, we'd see our world in a whole new way." So begins this endlessly intriguing guide to better understanding all those really big ideas and numbers children come across on a regular basis. Author David J. Smith has found clever devices to scale down everything from time lines (the history of Earth compressed into one year), to quantities (all the wealth in the world divided into one...

Forces and motion are key concepts in the elementary science curriculum. This Spanish edition of How Simple Machines Work uses simple text and full-color photographs to help ELL students understand the principles behind simple machines. Each volume includes three diagrams to enhance comprehension. The text uses authentic language and is designed to build reading skills as well as knowledge of basic science concepts.

Severn Cullis-Suzuki was only twelve years old when he addressed the entire world: What are we doing to Earth, our home? How far can human greed go? Little Severn embarrassed the world leaders and asked them to be consistent, that their actions would reflect their words. An emotional speech, full of truths as simple as they are revealing, and even more relevant today than when it was delivered. This is a bilingual edition.

Describes the physical characteristics, habitats, life cycle, and behavior of different kinds of reptiles, including alligators, turtles, snakes, and lizards.