Here is a collection of resources that junior school students can use when researching. Remember, don't write the whole question in a search engine, just write keywords.
A great alternative to Google. It offers an encyclopedia and dictionary definition of any keywords you search for along with a safe and age appropriate internet search.
Encyclopedia Britannica Kids
On the front page under the search box you can select whether you are search for a child (age 8-11) or a student (age 11+) as well as a dictionary and thesaurus.
Kids Net uses a Google custom search to filter out most inappropriate websites but is a little tricky to use.
A resource to help you access information on specific topics. It's better to browser through the links because the search feature is a little tricky to use.