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...

¿No sería increíble que nuestros papás nos adelantaran nuestros regalos de cumpleaños y que al llegar ese día nos hagan, además, una fiesta? ¿O que nos perdonaran pronto las travesuras? El protagonista de estas historias tiene unos padres así, y para él son lo máximo, pues lo apoyan en todo, sin importar lo disparatado de sus ideas, y juntos pasan momentos tanto desastrosos como divertidos. Una serie de ingeniosas historias sobre la unión familiar y los lazos incondicionales.

Describes what early planes and air travel were like, how planes were developed to travel faster, and presents some pioneers of aviation.

Aprende todo sobre las serpientes en este emocionante libro para niños. Está lleno de imágenes bellas e interesantes que les enseñan a los niños todo sobre estos animales asombrosos. Este libro de Nivel 2 es apropiado para los primeros pasos de lectura independiente o para una experiencia de lectura en voz alta, ¡perfecto para motivar a futuros científicos y exploradores!