La Materia (Matter)

What causes sound? How does sound travel? Sound begins when matter vibrates. Without this vibration sound could not move and nothing would make any noise. Starting with tiny molecules, this book explains the main concepts of sound and furthers understanding through a series of easy-to-do experiments that will appeal to readers of all ages.

Examines the nature of inclined planes and wedges, how they can reduce the amount of force necessary to perform work, and ways in which they are used.

"With vivid photographs and simple text, books in this series introduce children to the concepts of currency, exchange, and global diversity. In this book, children learn how people spend money on goods and services around the world."

Describes the raid on an armory in Harpers Ferry, West Virginia by John Brown, an abolistionist, in 1859. In graphic novel format.

Accelerate through the pages of this book and introduce readers to physics and how it assists objects to move. This stimulating, Spanish-translated nonfiction title includes real-life examples and basic experiments to facilitate further understanding of physics. Readers will learn about velocity, Newton's Second Law of Motion, thrust, gravity, momentum, and g-force through vibrant and colorful images, fascinating facts in conjunction with informational text, accommodating graphs and diagrams.

Ante la importancia de la educación como base de la competitividad en una economía basada en el conocimiento, las universidades han incrementado su atención en la calidad de sus programas de doctorado. Sin embargo, se aprecia que aún son escasas las instituciones educativas que tienen en su programa, una asignatura destinada a cómo escribir y publicar una tesis doctoral. Este libro es el resultado de varios años de experiencia en supervisión de tesis doctorales en programas de diversas universidades. Los contenidos y la estructuración de los mismos han sido contrastados con alumnos y...