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

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.

When rocks change because of environmental conditions, the new rocks are called metamorphic rocks. A rock's chemical or physical makeup may change because of conditions such as temperature, stress, or pressure. Your readers will learn fascinating facts including where metamorphic rocks are most commonly found, the different types of metamorphism, and how metamorphic rocks are identified. Full-color photographs depict these rocks in nature. A helpful graphic organizer shows how these fascinating rocks form.

A young boy travels to China to learn about the people and culture of one of the world's most powerful nations.

Learn about the Victorian era while building your knowledge of equivalent fractions! Students will learn fractions while engaged in reading about the innovations of the Victorian era. This Spanish book combines mathematics and literacy skills, and uses practical, real-world examples of problem solving to teach math and language arts content. The glossary, index, and table of contents will further understanding of reading and math concepts, and the full-color images, practice problems, and math graphs and charts make learning math easy, practical, and fun. The Explore Math sidebars and Math...

This novel tells the remarkable story of an unusual community of Siberian bandits who are the opponents to Stalin and deported to Transnistria, a long section between Moldova and Ukraine, even today no man's land, ravaged by corruption, organized crime and smuggling. There grew up Nikolai proud to recognize no other authority than his elders and defining themselves as honest criminals.

La celebración del Cinco de Mayo es una fiesta que recuerda la primera vez que las tropas imperiales de Napoleón III caían vencidas, demostrando que no eran invencibles. Y fueron vencidas en la Batalla de Puebla por un grupo en desventaja militar y numérica, para mayor deshonra de Napoleón III. Sin embargo, no es un día feriado en todo el país. En Puebla, por razones obvias, se celebra año a año, algunas veces incluso recreando la batalla. Pero no en el resto de México. En los Estados Unidos de América, en cambio, se celebra sólo en los estados del Sur que fueron parte de México, ...