Cómo funcionan los ecosistemas

Antonio Machado es uno de los poetas más importantes que ha tenido nuestro país. Leonor, su esposa y su musa, era para él al alegría, la vida, la felicidad. Pero también la sabiduría. No la de los libros o las escuelas, sino la de las cosas pequeñas, esas cosas que Antonio convirtió en poemas. Poemas tan hermosos que hoy en día, verso a verso, seguimos recordando. Carmen Posadas nos acerca a Machado en el setenta aniversario de la muerte del poeta, con un texto emotivo que nos muestra que sin amor no hay vida, y tampoco poesía.

Learn all about the law of conservation of mass with this Spanish science reader that brings the power of science and informational text to students at a level they can understand. Introduce students to STEM topics and new concepts and vocabulary terms with this nonfiction book that explores the law of conservation of mass in detail. Aligned to state and national standards, this leveled text supports students reading at above-, below-, and on-grade level. The fun lab activity encourages students to think like scientists. Keep students engaged in learning with this Spanish book.

Black holes are neither holes nor black. They're invisible and packed with matter! Future astronomers will find out many more fascinating facts about these space phenomena with this intriguing book. Carefully crafted text encapsulates the most important information about black holes, such as how scientists locate them and their significance in a star's life cycle. Amazing photographs support critical concepts and inspire a true appreciation of the spectacles of space.

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.