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.

Introduces the concepts of short and tall, comparing some of the world's shortest and tallest animals.

What causes sound? How does sound travel? Sound begins when matter vibrates. Without this vibration sound could not move and nothing would make any noise. Starting with tiny molecules, this book explains the main concepts of sound and furthers understanding through a series of easy-to-do experiments that will appeal to readers of all ages.

Una visión clara y amena de la trayectoria de uno de los personajes más fascinantes de la historia de Roma: Julio César. Las lágrimas de Julio César es una palpitante novela que recrea la intensa relación de Julio César con Hispania, tomando como punto de partida su llegada a la península Ibérica en el año 68 a. C. Cónsul, dictador, eficaz estratega e ilustrado gobernante, César alentó sus sueños políticos en la ciudad aliada de Gades, desde la cual se reconstruye la historia del estadista, su destino, sus fantasías, sus victorias, obsesiones y afectos. En Las lágrimas de...

Describes the life of a baby seal, from birth with fur so wet it looks yellow, through molting and learning to swim and hunt, to setting off into the open sea.