Love this interactive science site! My 3rd and 6th grader have learned about everything from the parts of a flower, to electrical currents and melting points. The games are really engaging; this has been a great supplement to our homeschooling.
Science Fair: Everything You Need for Elementary School! Includes a 14 slide PowerPoint introduction for students and a 25 page PDF full of resources including a student proposal sheet, student checklist, sheets for a log, sheets for a report, rubric, and so much more!! Also includes an editable parent letter.
Free Educational Resource: ABCya.com Online Learning Games K-5