De natura

De manera imprevista, Willyrex y sTaXx se ven obligados a revelar su secreto a George del Toro, quien, tras superar el desconcierto inicial al escuchar la historia de los diminutos youtubers, terminará por reconocerlos y se comprometerá a ayudarñps a desenmascarar al culpable de su situación. Si en sus viajes anteriores visitaron Estados Unidos y México, nuestros amigos se trasladan ahora a la lejana Australia, el lugar que conducen todas las pistas y donde, si sus sospechas son ciertas, Willy y sTaXx confían en encontrar la clave que solucionará todo este embrollo en el que están...

The need for speed is the motivating factor in this engaging, Spanish book. Readers learn the history of travel from the very slow to the supersonic and beyond, including everything in between. They learn and discover the factors that influence motion for all types of vehicles: land, air, and water alike. They also learn different ways to measure speed and read about energy uses for different vehicles. With greater speed comes greater risk. Readers learn how engineers are always seeking new and better ways to keep people safe as they travel faster and go farther. This 6-Pack includes six...

Besides oil, Texas has long been associated with cattle and agriculture. Learning about these industries will allow readers understand how valuable their development is to the growth of the state of Texas, as well as America's economy.

This Spanish-language series presents the complete range of math concepts and skills students are expected to master during the first grade. The series moves sequentially, from easiest to hardest concepts, with each book covering a different math topic. The first volume reviews the math concepts students learned in kindergarten. The next six books cover counting, adding and subtracting, tables and graphs, money, patterns, and measuring. The eighth volume is a summary of the math concepts students have studied throughout the year. Each book presents situations that show the relevance of math...