Mi mamá

Young readers will enjoy and relate to these charming, vibrantly illustrated stories as Barney and his friends teach them a thing or two about visiting the doctor, getting along with others, behaving, and more. Text copyright 2004 Lectorum Publications, Inc.

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.

Gira las ruedas, abre las ventanas y despliega las solapas para averiguar muchas cosas sobre los huertos y el cultivo de los alimentos.

Who were the earliest Americans? When, how, and from where did they enter and spread across the continent? And what is their relationship to modern Native Americans? Anthropologists develop theories to answer these questions based on the evidence they discover. Their theories—and the discoveries that prove and disprove them—are highlighted in this fascinating volume, full of awe-inspiring facts and incredible breakthroughs. Readers will feel like anthropologists and archaeologists themselves as they read about bones and artifacts, and what they reveal about the ancient cultures that roamed...