¿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.

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.

Pets! We love them, and we take good care of them. Learn all about what Fish need to be happy and healthy pets. ¡Las mascotas! Las amamos y las cuidamos mucho. Aprende todo sobre qué necesitan los Peces para estar felices y ser mascotas saludables.

A collection of simple prayers arranged in such categories as "Mi hora de comer," Mis sentimientos," and "Mis días especiales.

2012 se presentó como un tiempo de conjura de demonios. Hay un momento en el que la oscuridad se cierne y parece impenetrable. Luego, pasada la tormenta, siendo consciente de que los hechos, personas y recuerdos que oscurecieron el horizonte ya no tienen la capacidad de hacer sangrar, llega la desorientación de un nuevo cielo despejado. Un mar sin puntos de referencia. Muchos de estos poemas son precisamente eso: estrellas fugaces en el cielo. Instantes a los que aferrarse con la desesperación de náufrago. Son versos de deriva, de búsqueda, de intentos desesperados de regeneración. una...

A biography telling the life story of Clara Barton, who served as a Civil War nurse, and started the American Red Cross. Written in graphic-novel format.