Desafíos matemáticos

When rocks change because of environmental conditions, the new rocks are called metamorphic rocks. A rock's chemical or physical makeup may change because of conditions such as temperature, stress, or pressure. Your readers will learn fascinating facts including where metamorphic rocks are most commonly found, the different types of metamorphism, and how metamorphic rocks are identified. Full-color photographs depict these rocks in nature. A helpful graphic organizer shows how these fascinating rocks form.

Feminismo ilustrado explica hasta dónde llega realmente el patriarcado con ejemplos del día a día, aclara conceptos de la lucha feminista, desmonta falsas argumentaciones en contra y e invita a detectar machismos de todos los tamaños y a prevenirlos. Todo ello acompañado de explicativas ilustraciones y de mucho, mucho humor. «Feminista» es una palabra que viene con mucho equipaje. Demasiado. En este libro la explicamos desde el humor y con viñetas. Tratamos de plantarle cara al machismo y de quitarle la máscara al patriarcado. A ver si, ilustrándolo, se entiende de una vez por todas ...

Learn more about the renowned British scientist, professor, and author who spent his entire career trying to answer the question: "Where did the universe come from?" Stephen Hawking was born exactly three hundred years after the death of the scientist Galileo, so maybe it was written in the stars that he would become a famous scientist in his own right. Although he was diagnosed with a neurological disease at age 21, Stephen did not let the illness define his life. Known for his groundbreaking work in physics, and identified by his wheelchair and computerized voice system, Stephen continued...

Este tomo te permitirá conocer mejor al canguro, un marsupial que sólo vive en Australia y Nueva Guinea. Las hembras de los canguros, como las de todos los marsupiales, poseen una bolsa o marsupio, en cuyo inteiror se amamantan las crías hasta que tienen ocho o diez meses. En este volumen se describen las diferentes variedades de canguro, desde el ualabi de cola corta, del tamaño de una rata grande, al canguro rojo, que mide más de dos metros de altura y pesa alrededor de setenta kilos.