This site offers over 1000 videos and activities in many subject areas including Science. Instructions, worksheets, quizzes, etc can be downloaded, printed, or written out by hand. Students should be encouraged to keep a journal for their inquiry-based science activities.
Entertaining educational videos, mini-lessons and games. BrainPOP Jr. spans topics across Science, Social Studies, Reading, Writing, Math, Health, Arts, and Technology.
Gently encourages young learners to ask questions and form their own ideas.
Multi/cross-disciplinary resource from K-12. Please note that while the site states that it is suitable for elementary/primary, it might be more suited for grades 3 and up.