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Text and photographs look at gemstones. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

An exploration of crystals that covers what they are, where they are found, how they grow, their uses, and more. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

Presents a short study of grasslands, covering where they are located, plants and wildlife, and more. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

Presents an introduction to nature's food chain, and looks at the role of decomposers in the cycle, explaining what they are, examining different types of decomposers, and describing their habitats. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

A short study of caves, discussing types of caves, where caves are found around the world, cave plants and animals, and challenges to the ecosystem. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

An exploration of levers, covering how they are used, their design, how they work, and more. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

Photographs and simple text provide an introduction to Uncle Sam. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

Simple text and illustrations describe the proper way to behave while on the telephone. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

Simple text and illustrations describe the proper way to behave while at school. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.

Text and pictures introduce the lever, a simple machine used to change force and motion. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.