La tumba tenebrosa

The varied projects in this volume present readers with more than a dozen lenses through which to learn about the progress and impact of the Industrial Revolution, and the tide of industrialization it unleashed, in the United States. Broad questions prompt readers to engage with major themes in civics, geography, economics, and history. A wealth of background information helps readers understand how these themes play out in the context of the profound shifts in the American economy and society that took place in the nineteenth and early twentieth centuries.

Interesting facts and experiments explore the dynamics of a race car engine to teach about air flow and drag, safety equipment and roll cages, the fuel system and horsepower, suspension and track bars, internal combustion, why race cars don't have speedometers, how roof flaps are designed like airplane wings, and more.

Explains the idea of taking turns and emphasizes how important taking turns is to being fair and being a good friend.

Último curso del colegio, última Semana Blanca. La joven Alma ya está preparada para demostrar a todos que no es una esquiadora, sino una verdadera snowboarder . Un viaje a la nieve y una historia entre pandillas de snowboard que compiten con el único propósito de demostrar quién es el rey del surf. Pero no todo sale según los planes previstos... Hay alguien más en la montaña. Alguien a quien no esperaban. Todos se complica. Empiezan los problemas. Alma descubre algo y todo da un giro inesperado.