Ciencias para el mundo contemporáneo

Young readers may have heard about the benefits of using and making the most of their resources, but how does that factor into an economic discussion? This thorough discussion defines resources and describes the different types of resources and why some divide them into three categories and others choose four. The book also addresses the concept of scarcity, showing readers how, because all resources have their limits, it is important to use them responsibly and efficiently in a healthy economy.

Voltaire, considerado como una de las personalidades más brillantes y provocadoras de su época, fue un luchador infatigable contra la intolerancia, un defensor de la Ilustración y un agitador de conciencias demasiado satisfechas y adormiladas. Sus cuentos son, posiblemente, la mejor contribución que nos ha dejado, con unos personajes que siguen despertando en nosotros la curiosidad y la perplejidad, nos hacen dudar de cosas ya sabidas o bien afirmarnos en otras que pensábamos. Las historias que recoge este volumen (El ingenuo, Micromegas, Historia de los viajes de Escarmentado y...

Imagine being lost and stranded in the desert. Would you know what to do to survive? This useful Spanish-translated nonfiction title explains the important skills needed to survive in the desert. With helpful diagrams and images, definitions, tips and instructions, informational text, a bibliography, and a list of other helpful websites, readers can be assured that they will learn about the dangers of heat exhaustion, desert plants that could aid in survival, and other helpful tips in order to survive in an emergency.

Illustrations and text present the history, geography, people, politics and government, economy, and social life and customs of Arizona, the Grand Canyon State.