Exploremos las rocas sedimentarias (Exploring Sedimentary Rocks)

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.

When winter hits, many people in colder climates spend most of their time indoors. But what do wild animals do? Some animals spend winters hibernating. Beginning readers will learn what hibernation is, why some animals hibernate and others don't, and how hibernating animals prepare for their long sleep. Full-color photographs grab readers' attention and allow them to draw connections to the narrative. Readers will love learning about this mysterious, restful time in some animals' lives.

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.

Born into slavery, Frederick Douglass relied on his own determination and ingenuity to carve a path to freedom. Once free, he dedicated his life to improving the lives of others and fighting for justice and equality. This inspirational Spanish biography uses primary sources to engage students in learning about the fascinating life of Frederick Douglass. Students will build their literacy skills as they are immersed in social studies content. Text features include a glossary and an index to increase comprehension and academic vocabulary.

Sofía and her friends accuse someone of theft based on his appearance, but when the truth comes out, they learn a lesson about passing judgment based on superficial traits.

When they were teenagers, George and Natalia fell madly in love, but his being American and her being Spanish forced them to separate. Ten years later, they meet again and those feelings resurface with overwhelming force. Nat, aware of her difficult personal situation, refuses to give love a chance, but George is not ready to lose the woman he has always loved.

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...