¿Por qué hibernan los animales? (Why Animals Hibernate)

The rock cycle has been taking place for millions of years. However, geologists have only known about this phenomenon for about 300 years. Young terrestrial explorers are introduced to different types of rocks, where in the cycle these rocks fit, and where in Earth's layers each step takes place. Fact boxes provide readers with fun additional information. A diagram helps readers make sense of the new information they're learning.

Diamonds and salt are both minerals, but diamonds are more rare than salt. Curious readers will learn what physical and chemical conditions must be present for minerals to form. They'll discover how minerals are identified and how they are used in daily life. Informative and interesting text presents readers with this science content in a fun way. A graphic organizer shows how different minerals are identified and fact boxes provide readers with exciting supplementary information.

Surveys the life of Nathan Hale, a Revolutionary War hero whose service to George Washington as a spy cost him his life.

In this Spanish title, learn causes of extinction and what problems extinction causes for animals, wildlife, and humans alike.

Ésta es la historia de dos príncipes hermanos unidos por su lucha común contra el usurpador que provocó la muerte de su padre y robó su trono. Ambos irán distanciándose en una rivalidad por la pasión que despierta en ellos la misma fascinante mujer, y porque las propias gestas que les reportan poder y gloria también les hacen saborear el sutil veneno del orgullo, la ambición y la envidia... pues sólo uno puede ceñir la corona. Leeréis una epopeya fantástica pero pseudohistórica, en un mundo imaginario lleno de aventuras.

Think there's just one fairy tale with a beautiful girl and an evil stepmother? Think again! Cultures all around the world have their own Snow White stories. Visit Albania, Germany, Mozambique, and Turkey, and find out who meets 40 dragons instead of "seven dwarfs," and on whose forehead a bright star shines. Fully translated Spanish text.