¿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.

This complete Spanish translation of the highly acclaimed Isaac Asimov's 21st Century Library of the Universe is ideal for students still developing their English-language skills.

En los veintiséis relatos que contienen este volumen, Gianni Rodari plantea y describe de forma magistral situaciones llenas de humor, imaginación y fantasía, para ofrecernos su visión del mundo que nos ha tocado vivir.

The conjunction of imaginary characters and objects from daily life are presented to help little ones find a connection between both elements, showing each character, object, situation, and activity in its context. PP.

Jemima Kincaid es feminista y cree que todos deberían serlo. Su colegio está lleno de tradiciones arcaicas, incluyendo el baile de graduación; si una chica quiere ir, debe esperar pasivamente a que un chico la invite, dándole a él todo el poder de decisión. Cuando Jemima es nombrada parte del comité organizador del baile junto con Andy, la estrella del equipo de futbol americano y Ginnifer, la típica niña perfecta y popular, ve una oportunidad para cambiar las cosas. Inspirada en sus ideales y el deseo de dejar una marca en su escuela, Jemima propone una nueva dinámica para el baile ...