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National Geographic Education brings geography, social studies and science to life. Using real-world examples and National Geographic's rich media, educators, families, and students learn about the world and the people in it.

Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

Science, astronomy, and space flight news, science and renewable energy encyclopedias. Maintained by science writer David Darling, Ph.D.

In our site you will discover facts about our planet, its complex patterns of biomes, plants, and animals, and how climates ultimately determine the biomes of our Earth.

Dive into expert advice all about animals with PawNation Animals, the one-stop-shop for cute and cuddly critters, exotic pets, wildlife and much more!

World Wildlife Fund - The leading organization in wildlife conservation and endangered species.

TFD Encyclopedia includes Computer Desktop Encyclopedia, Columbia Encyclopedia and many other great sources.

Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias. Ask questions, get answers.

Providing researchers with access to millions of scientific documents from journals, books, series, protocols and reference works.

Encyclopedia.com – Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our FREE, online library.