Matemáticas 3o Primaria. Proyecto Ágora

Defines screws, explains their functions, and suggests simple experiments to demonstrate how they work.

Describes which animals are loud and which are quiet, including such creatures as cicadas, whales, mice, and fish.

When people go to sleep, bats are just waking up. While young readers may recognize the image of bats in the night skies, where they live may be less familiar. This title takes readers inside bat roosts to uncover the fascinating facts about this creature. Readers will learn the basics of bat roosts—in caves and beyond—and how they help bats survive in the wild. The text also looks at bat’s appearance, behavior, and the crucial role they play in nature’s ecosystems—topics covered in most elementary science curricula. Diagrams, fact boxes, colorful images encourage learning.

Ideal for English language learners, this Spanish-language series provides a lively first look at people and countries around the world. The simple text is supported by large, colorful photos. Titles feature an overview of each country's people, land, weather, homes, food, and lifestyle.