Energía del viento

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.

Follows the life and career of the French scientist who proved the existence of germs and their connection with diseases.

Defines screws, explains their functions, and suggests simple experiments to demonstrate how they work.

Alguien está dando muerte a los Cazadores de Sombras del círculo de Valentine, y esas muertes enemistan de nuevo a los Cazadores de Sombras con los subterráneos. Sólo Simon, ahora convertido en vampiro, podrá evitar el enfrentamiento. Mientras, Clary y Jace descubrirán un misterio que les llevará a fortalecer su relación o... a destruirla para siempre.

Our solar system is made up of the millions of objects in the sky above us, including the Sun, moon, stars, and planets. This book examines the four planets closest to the Sun, known as the rocky planets. All four planets, Mercury, Venus, Earth, and Mars are described with information about their atmosphere, landscape, orbits, and Fun Facts that give additional information about each of these rocky planets! This book will allow students to use observations of the Sun, moon, and stars to describe patterns that can be predicted.

Every year, North Americans fly the American flag on June 14th. This show of patriotism isn't in anticipation of Independence Day; it's a different holiday entirely. Flag Day is a celebration of the adoption of the Stars and Stripes as the official flag. The book helps beginning readers learn about the American flag, how we take care of it, and how we honor it as a national symbol.

Pilar the foal is nervous about starting school, so her mother pampers her. Includes facts about horses.