Dinosaurios, garras y crestas

Humans and animals can also make a great team working together. See how horses and the officers who ride them work together to keep our streets safe.

Learn How Dams And Levees Are Built As Well As The Effects They Have On River Systems In A Region, And Places Downstream.

Follows two children as their family adopts two guinea pigs, offering information on cages, health concerns, handling, behavior, and diet.

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.

Esta noche la libertad relata la caída del imperio británico en La India en 1947 y el nacimiento de La India y de Paquistán, siguiendo los pasos del último Virrey de la India, Lord Mountbatten y de Mahatma Ghandi. El libro concluye con el asesinato de éste ultimo. Para escribir Esta noche la libertad, Dominique Lapierre y Larry Collins necesitaron cuatro años de esfuerzos, recorrieron 250.000 kilómetros utilizando todos los medios de locomoción imaginables, incluido el caballo y el elefante y recopilaron miles de páginas de archivo, de fotografías y de documentos inéditos.

"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...