¿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.

¿Puede un día soleado convertirse en una noche estrellada? ¡Descúbrelo! Las cosas no siempre son lo que parecen...

También tú crees que eres más sincero e inteligente que la media? ¿Te dices cada día que sí, que mañana empiezas la dieta definitiva? ¿Te dejas influir por informaciones irrelevantes? ¿Tienes una «memoria creativa»... y recuerdas cosas que no han sucedido jamás? En este libro los protagonistas somos nosotros, nuestro modo de pensar, nuestros razonamientos y nuestros prejuicios. En estas páginas encontraremos una enciclopedia de bolsillo ideal, de la A a la Z, con la que idear, fabricar y sobre todo desactivar los más insidiosos ardides de la mente y aprender a hacer lo correcto. ...

This book uses intriguing primary sources to teach students about rules and why following them is important. The primary source images and simple sentences will engage students in reading and build their social studies content knowledge. For use in the classroom or at home, this Spanish book includes a simple glossary and index to introduce informational text features to young readers and provide additional reading support.

Ants are known as one of nature's hardest working animals. Their strength and persistence in bringing food to their colonies have been well documented. Now, beginning readers have a chance to learn about some of the littlest bugs in this volume written just for them. Complete with information about what ants eat, how they live, and generally how they stay so busy, this book is a must-have to satisfy the curiosity of your youngest naturalists. Eye-catching and unique photographs complement the low-ATOS text and aid in comprehension.