A kid-friendly search engine. Students should learn more than Google, and this site will also pretty much assure age-appropriate sites.
This is an amazing resource. The site's goal is to document every species. May not be so useful as a straight-up reference site, but maybe over time. Could be useful for students trying to learn classification/taxonomy.
School version of EB - can select Elementary, Middle School or High School level.
From the Bureau of Labor Statistics. Career information for K-12 students.