Facts about the tundra to teach to children are available on websites such as National Geographic or the University of Santa Barbara. Tundra facts can also be found in books such as "Explore the Tundra" by Linda Tagliaferro and "Arctic Tundra" by Michael Forman.
Additional resources to consider are local museums and science fairs. Customers browsing Amazon.com can bring up a list of children's books in its environment and ecology section that contain facts about the tundra. On the University of Santa Barbara website, an entire section is devoted to kids learning about ecology and how they can get involved.