Grant Hill, Estrella del Basketball

Life on Earth depends on carbon. In fact, about 18.5 percent of a human body's mass is carbon. How carbon is taking in and given off through animals' breathing, the burning of fossil fuels, and more can be shown in the model known as the carbon cycle. Though this concept can be confusing, all readers have a chance to understand this concept through the text and simple diagrams in this book. Both struggling readers and those looking for review can find the most important components and vocabulary of the carbon cycle in low-level, accessible text.

Surveys the life of the American statesman, lawmaker, writer of the Federalist Papers, and first secretary of treasury under George Washington.

What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines make doing work easier.

Lectura graduada para adultos para el aprendizaje de español como lengua extranjera. Nivel básico (A1-A2). Marca España es la nueva imagen que España quiere ofrecer dentro y fuera del país: la de una sociedad creativa, internacional y que busca la calidad. En cada libro se aborda un tema que va desde el mundo empresarial a la gastronomía, pasando por sus manifestaciones artísticas más importantes. Se incluye el CD con el relato completo y un vídeo.