Estaciones de policia

Discover how the butterflies colors are made up of, how they eat, and how they become the beautiful insect you see today

Discover That There Are Over 8000 Kinds Of Ants Of Different Sizes, How They Live, Where They Live, And How They Reproduce.

Hace más de cuatrocientos años, Galileo dirigió su telescopio hacia el cielo: ese fue el inicio de una exploración increíblemente emocionante de la inmensidad del Universo. Con este libro viajaremos por el cosmos, calcularemos la fuerza de la gravedad, descubriremos Urano y los rayos infrarrojos, entraremos en el código secreto de las estrellas, averiguaremos a qué distancia están las galaxias, conoceremos las gigantes rojas, el eco del Big Bang, los agujeros negros y también nos enteraremos de por qué el color de una estrella puede revelarnos su velocidad.

Presenta varios experimentos en cronometría. Para estudiantes de primaria (grados 4-6) y de secundaria (grados 7-9).

Nuestro mundo, with Tu mundo, is a complete, two-level Spanish program for native Spanish speakers, providing focused treatment of Spanish-speaking peoples, including language, literature, culture, and history.

The unsinkable luxury liner known as the Titanic may have sunk on its first transatlantic voyage in 1912, but people remain riveted to its storied legend. The collision with the iceberg in the North Atlantic was not the only mistake that was made that day. In this spellbinding volume, readers will learn about the passengers and crew aboard the doomed ship and what really happened that tragic night. Historical photographs will transport them back to the glamorous era, while the narrative paints an absorbing picture of the Titanic's sad fate.