Exploremos el ciclo de la roca (Exploring the Rock Cycle)

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.

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.

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.

¿Chocolate o vainilla? ¿Dulce o salado? ¿Gatos o perros? Cuando de ciertos temas se trata, todo niño tiene sus preferencias. Desde que existen las mascotas, el debate entre tener un gato y tener un perro ha sonado fuerte durante los recreos y almuerzos en todos los colegios del mundo. ¿Cuál es mejor? ¿Cuál es más inteligente? Este libro presenta los hechos de manera divertida e informativa. A los niños les encantará leer este texto de Nivel 3 para decidir cuál es la respuesta a la pregunta eterna - ¿gatos o perros? NationalGeographic apoya a los educadores K-12 con Recursos del...

Un canto a la libertad, el amor y la amistad. Este libro recrea la vida de Hipatia de Alejandría, una figura capital de la antigüedad y protagonista del filme Ágora, de Alejandro Amenábar. Estuvo versada en filosofía, matemáticas y astronomía, pero su clase magistral para la historia fueron su sed de vida y de conocimiento, así como el valor y la entereza para defender sus ideales de convivencia y tolerancia. Hipatia fue un espíritu libre, una voz incómoda a causa de la férrea voluntad de llevar una vida plena como mujer sin pedir perdón por ello, aunque debiera pagar por ello el...

Let's explore the diverse biomes and geography that covers the vast expanse of Canada! This book also highlights the different animals that inhabit this country as well as Canada's most popular sports. Language arts connection is vocabulary related to Canada, its varied landforms, and inhabitants.

In this Spanish title, learn about what makes endangered jungle animals so unique and why they need to be protected.