Piedra de toque

Presents a variety of information on snakes, including the reproduction, the predators of the snake, and other behaviors of the snake.

CONTENIDO: Las Coplas por la muerte de su padre, son una elegía escrita por Jorge Manrique en la muerte de su padre, el Maestre de Santiago don Rodrigo Manrique. Escritas, al menos una parte, con posterioridad al 11 de noviembre de 1476, fecha de la muerte de don Rodrigo Manrique, constituye una de las obras capitales de la literatura española y, sin duda, el mejor poema lírico de la poesía medieval castellana. Esta obra pertenece al género poético de la elegía funeral medieval o planto y es una reflexión sobre la vida, la fama, la fortuna y la muerte con resignación cristiana. Se...

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...

In this stimulating, Spanish-translated nonfiction book, readers will discover the various types of friction--including rolling friction, sliding friction, fluid friction, and static friction--and the huge impact it has on nature, machines, and our lives. In addition, readers are encouraged to perform basic experiments to assist in the understanding of friction, kinetic energy, and water resistance. With real-life examples, colorful images, accommodating graphs and charts, and informational text, this title will inspire and engage children.