Food Chain and Energy

http://www.usoe.k12.ut.us/curr/science/core/8thgrd/sciber8/bio_ener/html/enrgyflo.htm

Reversible changes, or irreversible?

http://www.bbc.co.uk/schools/ks2bitesize/science/activities/reversible_irreversible.shtml

Living Things

http://www.bbc.co.uk/schools/ks2bitesize/science/living_things.shtml

Physical Science

http://www.bbc.co.uk/schools/ks2bitesize/science/materials.shtml

Physical Processes

http://www.bbc.co.uk/schools/ks2bitesize/science/physical_processes.shtml

Mean, median, mode

http://www.bbc.co.uk/schools/ks2bitesize/maths/activities/modemedianmean.shtml

Comparing the Sun and the Planets

http://www.sciencenetlinks.com/interactives/messenger/psc/PlanetSize.html