Kids.Net.Au

Kids.Net.Au is a "search engine for kids, children, parents, educators and teachers" and includes its own dictionary, thesaurus, and encyclopedia services. It even has some information on...you guessed it: quarks!

The Kids.Net.Au dictionary defines a quark as a "hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3", and also lists hyponyms and translations for "quark" into 25 other languages!

The encyclopedia entry offers a summary of the history of quarks and their discovery.

Kidipede - Science for Kids

Kidipede is a "kids' encyclopedia, online since 1996." Divided into different resources by subject, the Science for Kids section offers an overview of scientific topics geared toward students in the middle grades. Check out the Chemistry area to find out a little more about atoms, or get as tiny as possible and brush up on your quark knowledge!

An interesting site that also offers some book suggestions for further reading, although you'll have to deal with occasional ads while navigating this sit.