¿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.

Cuando Arthur Miller escribe y estrena en 1955 Panorama desde el puente es, sin duda, un autor ya consagrado tanto en Estados Unidos como en el resto del mundo. Una vez más, el dramaturgo norteamericano sigue empeñado en mostrarle al hombre contemporáneo quién es y cómo vive, y le invita a reflexionar sobre quién podría ser y cómo podría vivir. Esta obra tiene su origen en una historia que Miller escuchó mientras trabajaba en los astilleros de Brooklyn: un estribador había denunciado a dos hermanos ante las autoridades de Inmigración. El tema de la inmigración es justamente el...

A lift-the-flap book showing milestones in a baby's development during pregnancy and the mother's experiences as it grows.

Las cobijas no son calientes. ¿Entonces por qué nos dan calor? Descubre la respuesta y otras curiosidades del calor en este libro sobre la temperatura.

Light can travel faster than anything else in the universe. But what exactly is light, and where does it come from? This nonfiction Spanish book teaches students all about light, and introduces them to important scientific concepts and vocabulary terms like infrared, ultraviolet, photos, and visible spectrum. The intriguing images, detailed diagrams, and stimulating sidebars will keep students connected to the text. The fun lab activity provides a real-world learning experience that supports STEM instruction. Aligned to state and national standards, the leveled text supports differentiation....