The Goggle Custom Search Tool allows you to easily build your own search engine customized with content for your grade level or for a particular unit of study. The tool helps you teach students to search for information, but it limits the search to websites you have chosen as appropriate. It can be embed into your own blog, wiki, or site.
Do teach students that the customized search tool only searches websites you have identified, and consider allowing them to build a custom search of their own when teaching them how to evaluate reliable websites.
Try this example, created for finding information about Regions of the United States.
Go to Google Custom Search