¿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.

¿Dónde buscarías algo que no has visto nunca? ¿Dónde van a parar las cosas que se pierden y son invisibles? Mariú quiere encontrar la paciencia que ha perdido su madre, pero no sabe por dónde empezar a buscar.

This delightfully whimsical story explains pregnancy to children. My Mommy's Water Balloon satisfies a child's natural curiosity about the changes in their Mommy's body while providing concepts that small children can understand, and making the real connections to the beautiful process of pregnancy.

¡Hola! Soy Antonio Berni. ¿Quieren conocer mi historia, mis ideas, mis secretos, mis personajes…? De adelante para atrás y de atrás para adelante… en este libro encontrarás: relatos, imágenes, preguntas y juegos. ¿Qué es lo que Antonio Berni sentía, pensaba, creía y soñaba? ¿Cuáles fueron sus intereses, pasiones e ideales? ¿Cómo se reflejan en su arte? ¿Cómo se entrama su obra con el contexto social en que fue creada y con el actual?

Forces and motion are key concepts in the elementary science curriculum. This Spanish edition of How Simple Machines Work uses simple text and full-color photographs to help ELL students understand the principles behind simple machines. Each volume includes three diagrams to enhance comprehension. The text uses authentic language and is designed to build reading skills as well as knowledge of basic science concepts.