¿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.

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.

Escritos entre 1924 y 1932, los microgramas son el testamento literario de Robert Walser. Se trata de una colección de 526 hojas y papeles de distinto formato densamente cubiertos de una letra minúscula, escritos a lápiz e ilegibles a primera vista. La minuciosa labor de Werner Morlang y Bernhard Echte, que dedicaron más de quince años a descifrarlos letra a letra, puso fin al desconcierto y reveló como una colección de textos breves, poemas y dramas en verso de incalculable valor literario lo que en un principio parecía fruto de la locura del autor suizo. El propio Walser reconoció...

What does the phrase "once in a blue moon" refer to? What is the difference between a waning gibbous moon and a waning crescent moon? What is the atmosphere on the Moon like? How does the Moon create tides? Students will learn the answers to these questions and more as they read all about the Moon! This nonfiction Spanish book introduces students to important scientific concepts and vocabulary as they are engaged in reading. The colorful images, diagrams, sidebars, and text features will keep students connected to the text. Aligned to state and national standards, the fun lab activity...

El amor duele, o eso pensaba en aquel entonces, cambié de parecer conforme pasó el tiempo, sin embargo, toda esa transición y cura, las fui dejando aquí, para el amor de quien creí alguna vez la mujer de mi vida. La hice poesía, para recordarla y amarla eternamente, aunque yo muriese entre mis letras ella me encontraría cuando me necesitase. La amé con el alma, se llevó una parte de mí, y es por eso, que lo que quedó lo dejo aquí.

Presents aerial photographs of various scenes from around the world including fishermen in Morocco, a farm on the island of Crete, and a mangrove forest in New Caledonia.