Nuestro Planeta, la Tierra

Más del 90% de la biodiversidad del planeta Tierra son microorganismos. Por otra parte, la idea que tiene la gente de los microbios no puede ser más negativa: son unos seres arteros, sigilosos y nocivos que aprovechan cualquier ocasión para ponernos enfermos, y que, incluso, pueden causarnos la muerte. Pero los microbios, también realizan el reciclado de los elementos químicos, producen el oxígeno que respiramos, nos permiten digerir los alimentos y nos defienden de muchas enfermedades. Los microorganismos aportan a la biosfera muchos más beneficios que inconvenientes. Para empezar a...

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...

"With vivid photographs and simple text, books in this series introduce children to the concepts of currency, exchange, and global diversity. In this book, children learn how people spend money on goods and services around the world."

From the Carnival celebration in Ponce to El Yunque National Forest, there's a lot to see and do in Puerto Rico. This island territory lies in the Caribbean. Puerto Rico introduces the state's history, geography, climate, economy, people, and places. Easy-to-read text, vivid images, and helpful back matter give readers a clear look at this subject. Features include a table of contents, infographics, a glossary, additional resources, and an index. Aligned to Common Core Standards and correlated to state standards. Core Library is an imprint of Abdo Publishing, a division of ABDO.