Exploremos los minerales de la Tierra (Exploring Earth's Minerals)

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.

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.

Se estructura por Unidades y cada una de ellas consta de los siguientes elementos: - Esquema de toda la Unidad o de diferentes apartados de la misma. - Definición de los términos más importantes que han aparecido a lo largo de la Unidad. - Textos filosóficos con actividades. - Ejercicios de autoevaluación. Al final de la guía se ofrecen dos anexos: - Relación de términos definidos por orden alfabético. - Solucionario de los ejercicios de autoevaluación.

Colección para preparar los Diplomas de Español como Lengua Extranjera (DELE). La serie prepara para la obtención de cada uno de los niveles del DELE y puede ser utilizada tanto en clase como de forma autónoma. El DELE es el título oficial y acreditativo del grado de competencia y dominio del idioma español. Es otorgado por el Instituto Cervantes en nombre del Ministerio de Educación, Cultura y Deporte de España, dentro del Marco común europeo de referencia (MCER) del Consejo de Europa.

As a successful former slave, Clara Brown used her money to help other freed slaves get a new start in life. In 1859 Clara bought her own freedom and headed west to Colorado to find her daughter, who was sold when she was just a little girl. Clara didn't find her daughter there, but she did get rich. The people she helped became her family, and she became known as "Aunt" Clara Brown.

Thomas Edison is considered by many to be one of the greatest inventors of all time. His creations changed the world, but there was more to his life than just his inventions. Readers of this engaging volume will learn all about the man behind the innovations. This fascinating biography introduces important subjects and encourages a further interest in history. Concise and accessible text paired with vibrant photographs is sure to captivate audiences of many ages and levels.