It is always a challenge to have 2nd graders research on the Internet. Either they will find inappropriate material, or the websites with the right information are written at a reading level that is too challenging. To avoid these problems I usually take the time to find websites ahead of time and create tiles on Symbaloo for my students to access.
A few days ago white reading the Technology Tidbits: Thoughts of a Cyber Hero blog, I learned about Choosito. Students can search a topic in this website and then filter their search by reading level, content area, and even sites approved by educators.