¿Por qué hibernan los animales? (Why Animals Hibernate)

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.

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.

What substance can act like both a solid and a liquid? Slime! Want to find out how to make your own? Just follow the simple steps inside this book

When President Thomas Jefferson bought the Louisiana Territory from cash-strapped France in 1803, he doubled the size of the United States without really knowing what he was getting. He dispatched Meriwether Lewis and William Clark and their Corps of Discovery to explore a territory that would include part or all of fifteen future states and to seek a water route to the West Coast. Westward expansion began immediately, all for the bargain price of 15 million dollars. This book richly explores this fascinating part of history.

Cuando se trata de cartografiar la Vía Láctea, los científicos saben una cosa con certeza. ¡Saben que todavía hay muchas cosas que no saben! Descubra cómo estudian la Vía Láctea y aprenda sobre la galaxia que llamamos hogar. Creado en colaboración con la Institución Smithsonian, este Texto Informativo del Smithsonian desarrolla las habilidades de lectura de los estudiantes mientras despierta su curiosidad sobre temas de STEAM a través de ejemplos del mundo real. Presenta un desafío STEAM práctico que guía a los estudiantes a través de cada paso del proceso de diseño de...

Este libro relata, en formato de novela gráfica, el asesinato de Abraham Lincoln. El presidente Lincoln fue asesinado en los Estados Unidos en un atentado personal en el Teatro Ford, ocurrido el 14 de abril de 1865, con un arma de fuego por un desconocido que más tarde sería identificado como John W.Booth. Abraham Lincoln murió por una herida de bala en la cabeza, sin orificio de salida, en la región occipital. De acuerdo a las descripciones de los médicos, dicha herida sería mortal incluso en el tiempo actual. Aún y cuando se le hubiera salvado la vida, Lincoln habría quedado...