Exploremos las rocas metamórficas (Exploring Metamorphic Rocks)

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 winter hits, many people in colder climates spend most of their time indoors. But what do wild animals do? Some animals spend winters hibernating. Beginning readers will learn what hibernation is, why some animals hibernate and others don't, and how hibernating animals prepare for their long sleep. Full-color photographs grab readers' attention and allow them to draw connections to the narrative. Readers will love learning about this mysterious, restful time in some animals' lives.

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.

Este libro nos descubre otra historia de los Kennedy, muy distinta a la desenfadada y frívola que se suele contar. La historia de dos hombres, el presidente y su hermano Robert, que mantuvieron una dura lucha contra las fuerzas oscuras de su entorno: contra los generales y los dirigentes del aparato de inteligencia, empeñados en arrastrar al país a una nueva guerra mundial. Una lucha que acabó con el asesinato de John en Dallas, que Robert estaba convencido que era obra de una conspiración del crimen organizado, la CIA y los grupos que planeaban una acción violenta contra Cuba, lo que...

Essays by well-known climbers accompany a range of superb color landscape photographs that echo the great traditions of the Ansel Adams and the Sierra Club large format books of the 1970s.

In the third book in Andrea Camilleri's Montalbano series, the urbane and perceptive detective exposes a nest of corruption and international intrigue in a compelling new case. When an elderly man is stabbed to death in an elevator and a crewman on an Italian fishing boat is shot by a Tunisian patrol boat, only Montalbano suspects the link between the two incidents.

What has a head, two tails, and shoots across the sky? A comet. Coming from the far edges of the solar system, most comets travel around the Sun, while meteors appear as flashing streaks of light in the night sky. Explore these amazing celestial wonders as they zip through space! This book looks at the difference between comets and meteors and their effects on Earth. The physical characteristics of each are identified in detail. This book won’t come crashing down! It’s filled with fun facts that give additional information on this exciting science topic. This book allows students to use...