La compra de Luisiana (The Louisiana Purchase)

Swamps are one kind of wetland biome. Like other wetland biomes, a swamp’s water must be clean in order for the wildlife in it to thrive. Readers learn the main features of both freshwater and saltwater swamps, as well as where some of the biggest swamps are on Earth. Science curriculum topics such as food chains and conservation make the main content a great complement to classroom learning. Full-color photographs and inset maps aid readers in identifying this interesting biome in the world around them.

Tras la muerte de una entrañable amiga, Carlos Alberto sufre una depresión. Su madre lo lleva a un psiquiatra, que le confía a un colega paralítico cerebral. Carlos se enfrentará a los prejuicios de su madre y aprenderá nuevos valores y el verdadero sentido de la responsabilidad.

Con la idea de que pensar y discutir sobre problemas matemáticos podría generar el mismo entusiasmo que practicar un deporte en equipo, en la antigua Unión Soviética surgió el singular movimiento cultural de los CÍRCULOS MATEMÁTICOS, que dejó tras de sí un intenso rastro de problemas, enfoques y textos. CÍRCULOS MATEMÁTICOS recoge parte de aquella emocionante experiencia.Es un libro de divulgación matemática dirigido a todos aquellos que sienta curiosidad por el juego mental que implican las matemáticas y que deseen indagar en sus ramas menos conocidas. También es un libro...

Teaches Young Readers About Shapes And Patterns Using The Seasons Of The Year And Pictures Of Nature.

Manifest Destiny the name given in the 1840s to a belief that the coast-to-coast expansion of the United States was both inevitable and justified, regardless of the means. Standing in the way were not only the native populations, but also the descendants of Spanish settlers who had lived in the Southwest for centuries. The racist belief that white men rightfully should expand their institutions into the area brought the United States into conflict with Mexico. War was declared in 1846, and by the time the Treaty of Guadalupe Hidalgo was signed in 1848, ending the war, the US had gained...