Exploremos las rocas sedimentarias (Exploring Sedimentary Rocks)

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.

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.

A biography of the Sioux chief who worked to maintain the rights of Native American people and who led the defeat of General Custer at the Little Big Horn in 1876.

The Uses Of Wind Energy Is The Topic Of This Book. Explains The Positive And Negative Impact This Form Of Energy Can Have On Our World.

3 million years ago, men built the first stone tools for hunting. 2 million years ago, men walked in a completely upright position and had already discovered fire. 1 million years ago, men organized themselves in groups... Okay, okay, but what about the women? Where were the women in the meantime?

¿Quién ha dicho que aprender historia no pueda ser divertido? ¡Descubre La loca historia de la humanidad y prepárate para la mayor aventura de todos los tiempos! ¿Cansado de clases interminables y libros de texto aburridos? ¡Prepárate para la diversión! Llega La loca historia de la humanidad, un divertido repaso por la historia del ser humano con una mezcla de humor, pasatiempos, curiosidades y explicaciones sencillas y amenas para pasarlo en grande. Y en este recorrido por la historia te acompañarán los Tempo, ¡la familia más alocada y aventurera de todos los tiempos! No te...