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

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.

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.

En 1919, el Congreso norteamericano aprobó una ley por la que se prohibía la fabricación y venta de bebidas alcohólicas en los Estados Unidos. Esta ley, conocida como Ley Seca, dio lugar a la mayor proliferación de bandas mafiosas y crímenes de sangre que haya conocido la historia de ese país. El escritor y periodista Walter Noble Burns (1872-1932) –autor de varias obras biográficas sobre legendarios personajes del Oeste, como The saga of Billy The Kid (1926), que hizo famoso al bandido adolescente, y Tombstone (1927), la vida del célebre marshall Wyatt Earp–, vivió en Chicago...

Describes tornadoes, how they form, and the tools scientists use to predict them--in both English and Spanish

¡Los niños aprenderán las palabras sencillas de español en este libro divertido y ilustrado, por ejemplo, soleado, calor, nublado, loviendo, viento, nevando, frío, hoy y el tiempo!(Children will learn simple Spanish words through this fun illustrated story, for example, sunny, hot, cloudy, raining, windy, snowing, cold, today and the weather!)There are so many different types of weather: sunny, cloudy, rainy, snowy and more! Which one is your favorite and what activities do you like to do? From sledding when it’s snowing to having a picnic on a cloudy day, young learners will enjoy the ...

Este poemario es para ti si te vistes de canciones para protegerte del frío y la lluvia. Si te inventas cada día un nombre nuevo porque no sabes con certeza quién eres. Si te queman las ideas y tu cuerpo se baña en el río de otro cuerpo. Si te pareces mucho a alguien que ya no está, como yo a J.Z.R., mi abuelo materno, a quien casi no conocí, pero que me ha traído hasta aquí y me hace investigar sobre mis antepasados cada día. Para él este libro y su portada. Y, sobre todo, si te gusta la poesía y comprendes que puede adoptar muchas formas. Y la quieres. Y la cultivas. Y te pasas...