¿Por qué hibernan los animales? (Why Animals Hibernate)

The rock cycle has been taking place for millions of years. However, geologists have only known about this phenomenon for about 300 years. Young terrestrial explorers are introduced to different types of rocks, where in the cycle these rocks fit, and where in Earth's layers each step takes place. Fact boxes provide readers with fun additional information. A diagram helps readers make sense of the new information they're learning.

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.

Although Earth is mostly made up of igneous and metamorphic rock, sedimentary rock covers about 75 percent of Earth's land surface. This means it's the most visible kind of rock on Earth. Sedimentary rocks form when sediment accumulates and compacts. Your readers will learn how sedimentary rocks form, the different types of sedimentary rocks, and how people use sedimentary rocks. Fun fact boxes provide readers with additional information. A helpful diagram illustrates how sedimentary rocks form.

En su etapa de estudiante (finales del 1425 - comienzos del 1426), el humanista Antonio Beccadelli, el Panormita, compuso el Hermaphroditus, título que alude al contenido tanto heterosexual como homosexual de la obra. Es una obra poética de carácter festivo que toma como modelo a Marcial y a los Priapeos, en la que revela que sabía compaginar bien sus estudios con la diversión de la vida estudiantil. Beccadelli aspiraba a que su obra estuviera a la altura de estos modelos. Pero esto no valió para sus opositores. El papa Eugenio IV prohibió la lectura del Hermaphroditus y en varias...

En 1931, Jorge Luis Borges (1899-1986) y Adolfo Bioy Casares (1914-1999) iniciaron una larga amistad literaria, cuyas consecuencias serían fundamentales para la literatura en lengua española. Desde 1947, el propio Bioy comenzó a registrar, con minuciosidad y precisión, las «interminables, exaltadas conversaciones» que mantenían casi diariamente, afanes en los que perseveró durante cuatro décadas y que condujeron a las 1700 páginas del extraordinario BORGES (Destino, 2006). Preparada también por Daniel Martino, se presenta ahora esta no menos indispensable edición de páginas...

Read Along or Enhanced eBook: Do you have something to celebrate? You can celebrate by making papel picado! Featuring vibrant step-by-step photo instructions, this Spanish-translated, nonfiction book helps introduce children to another culture through craft-making and designs.

A closer look at the stomach and how it works with the digestive system to give the body the nutrients it needs to stay healthy.