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

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.

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.

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.

Introduces the many levels of government leadership in the United States and discusses the presidency, Congress, state and local governments, and the judiciary.

Esa etapa de la vida a la que llamamos adolescencia, en la que la realidad se muestra confusa, en el que la conciencia y moralidad comienzan a evolucionar, cuando aparecen sentimientos, sensaciones o reflexiones morales que hasta ese momento se desconocían, es puntual en la vida de cada persona. En este libro el autor hace hincapié tanto en la parte sentimental como en la de la razón que tanto chocan en dicha etapa vital, con el objetivo de que cualquier tipo de lector, aunque está dirigida especialmente a la comunidad juvenil, se sienta como ente partícipe de lo que se expresa. Es, en...

Artaud escribió estas páginas inflamado por una pasión irreductible; su testimonio está sellado por la peculiar mirada trágica que lo caracterizó y por los relámpagos de una conciencia singularmente dotada Para explicarse, y hacernos ver el mundo en términos poéticos.

Death Valley is one of the hottest and driest deserts of the world! Readers are taken on an adventure through Death Valley to learn about the plants and animals that survive in this dry, hot desert landscape in this engaging, Spanish-translated nonfiction title. Featuring vivid photographs, informational text, and riveting facts about desert ecology, readers will be fascinated from beginning to end!