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....

Beautiful illustrations translate into suggestive images the two faces of the sea?the calm and the wind?enabling children to understand the meaning of the words themselves.

El koala es un marsupial que, en estado natural, sólo vive en Australia. Igual que las hembras de todos los marsupiales, como el canguro, las hembras de koala poseen una bolsa o marsupio, donde llevan a las crías y donde éstas se alimentan con la leche de las mamas. En este volumen, conocerás su forma de vida y sus costumbres.

A powerful and poetic play from the author of Death and the Maiden. A Man and a Woman in purgatory - a soul-less white room. Each is interrogated in turn by the other. Each is groping for forgiveness and contrition. But one of them has done something unforgiveable...

Esta edición pretende ser una guía práctica y completa para los maestros, educadores y alumnos que deseen profundizar en la reflexión que suscita la obra sobre temas como la libertad, la sexualidad o la locura y conocer los aspectos fundamentales de la singularidad literaria del autor.