Exploremos el ciclo de la roca (Exploring the Rock Cycle)

When winter hits, many people in colder climates spend most of their time indoors. But what do wild animals do? Some animals spend winters hibernating. Beginning readers will learn what hibernation is, why some animals hibernate and others don't, and how hibernating animals prepare for their long sleep. Full-color photographs grab readers' attention and allow them to draw connections to the narrative. Readers will love learning about this mysterious, restful time in some animals' lives.

Provides clues about a horse's physical characteristics, behaviors, and habitats in a guessing game format

Planck consideró como tarea científica suprema la búsqueda de las leyes que rigen el absoluto, el invariante oculto en la realidad externa. Le cupo el privilegio de descubrir uno de esos elementos universales: el quantum de acción, la constante h.

Children are encouraged to celebrate and appreciate both their own and other people's differences and shows how, when people of different races and ethic backgrounds come together, they make a beautiful rainbow.

Los tiburones son criaturas increíbles que nosotros los humanos recién comenzamos a comprender. Este libro, con fotografías de cientos de tiburones y la información más reciente, animará a todos a hacer algo por estos animales en peligro de extinción.