I think Wikipedia is a GREAT resource!
To me it should be the ‘first place to go’ for students… The start of research, before digging deeper and finding other sites.
The language can be a bit tough for ELL or younger students!
So, check this out:
Simple English Wikipedia: Wikipedias are places where people work together to write encyclopedias in different languages. We use Simple English words and grammar here. The Simple English Wikipedia is for everyone! That includes children and adults who are learning English.
AND for younger students:
Wiki for Kids delivered search results from the “Simple Edition” of Wikipedia and is powered by Google SafeSearch for added safety.