Conservación de la masa (Conservation of Mass)

Light can travel faster than anything else in the universe. But what exactly is light, and where does it come from? This nonfiction Spanish book teaches students all about light, and introduces them to important scientific concepts and vocabulary terms like infrared, ultraviolet, photos, and visible spectrum. The intriguing images, detailed diagrams, and stimulating sidebars will keep students connected to the text. The fun lab activity provides a real-world learning experience that supports STEM instruction. Aligned to state and national standards, the leveled text supports differentiation....

Written with sympathetic humor and compassion, this masterful portrait of upper-class decline made Ivan Goncharov famous throughout Russia on its publication in 1859. Ilya Ilyich Oblomov is a member of Russias dying aristocracya man so lazy that he has given up his job in the Civil Service, neglected his books, insulted his friends, and found himself in debt. Too apathetic to do anything about his problems, he lives in a grubby, crumbling apartment, waited on by Zakhar, his equally idle servant. Terrified by the activity necessary to participate in the real world, Oblomov manages to avoid...

Entra en el mundo de uno de los gatos más interesantes de la selva tropical. Este texto incluye fotos vívidas de jaguares que rondan por el suelo del bosque. Las preguntas de pensamiento crítico y un glosario de fotos proporcionan a los lectores los elementos básicos para la lectura de no ficción. Enter the world of one of the coolest cats in the rain forest. Now in Spanish, this carefully leveled text includes vivid photos of jaguars prowling the forest floor. Critical thinking questions and a photo glossary supply readers with the basic building blocks for reading nonfiction.

The asteroid belt between Mars and Jupiter is an intriguing area of our solar system. Scientists have counted over 670,000 known asteroids there, but there could be millions more not yet found. Readers will discover much more about the asteroid belt in this highinterest book, which blends science and math. They'll read about several topics, such as space missions to the asteroid belt and the difference between an asteroid and a planet, and solve associated math problems-just like actual space scientists do!

En este libro descubrirán que sí es posible desarrollar su potencial y alcanzar la excelencia sin una presión excesiva.