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

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.

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.

Build early literacy skills, and develop oral and written language skills in emerging Spanish readers with this leveled fiction reader.

El Papa Francisco, con gran alegría, ha querido que dediquemos un año a la Misericordia, para que todos aprendamos a amar a los demás como Dios nos ama. ¿Quieres descubrir cuánto nos ama Dios? ¿Deseas conocer cómo es su misericordia? En las páginas de este libro podrás seguir las palabras del Papa Francisco, leer las explicaciones y poner en práctica algunos propósitos.

Científico, pintor, médico y naturalista, las "Cartas sobre la pintura de paisaje" de Carus desbordan los límites de una canónica artística al uso y nos sitúan en el centro de la concepción románica de la naturaleza. No sólo porque exponen con precisión -no exenta de los recursos retóricos de época- las ideas centrales del paisajismo romántico de la primera mitad del siglo XVIII, también porque establecen con nitidez la relación entre arte, estética y ciencia, y , en todos los casos, la relación del hombre con la naturaleza. En palabras de Carus: =por ellas y mediante ellas...

Exploración espacial is one book in the Spanish-language Gran Atlas de la Ciencia series that covers today's most popular science topics, from digital TV to microchips to touchscreens and beyond. Perennial subjects in earth science, life science, and physical science are all explored in detail. Amazing graphics--more than 1,000 per title--combined with concise summaries help students understand complex subjects. Correlated to the science curriculum in grades 5-9, each title also contains a glossary with full definitions for vocabulary.