Kids Astronomy – Great website with plenty of information for you to learn about the solar system and various other topics related to astronomy. It includes games, worksheets and links to other helpful websites as well.
Science Monster – Loads of information about the solar system and the planets. Easy to read and understand and perfect for self-study or research.
Particle Theory – Quick simply interactive video/activity to learn about the 3 states of matter.
Mixtures and solutions – Grade 7 Science materials on mixtures and solutions.