Sun and Shadows.
Link
http://www.mmem.spschools.org/grade4science/lightandshadows/lightglossary.html
http://www.teachersdomain.org/resources/lsps07/sci/phys/energy/cgshadow/index.html
http://www.parentsconnect.com/do/Make_Shadow_Sketches.jhtml?ccc=10490&psc=10019
http://ksnn.larc.nasa.gov/k2/s_shadow_a.html
http://www.epa.gov/sunwise/kids/kids_uvindex.html
http://www.perpetualpreschool.com/preschool_themes/shadows/shadow_art.htm
http://www.gigglepotz.com/poem7.htm
http://www.peepandthebigwideworld.com/resources/pdf/peep-guide-shadows.pdf
http://pbskids.org/zoom/activities/do/shadowanimals.html
http://www.ngfl-cymru.org.uk/vtc/20050520/Science/Keystage2/Physicalprocess/Shadows/Introduction/default.htm
Interactive
http://www.bbc.co.uk/bitesize/ks2/science/physical_processes/light_shadows/play/
http://resources.woodlands-junior.kent.sch.uk/revision/Science/lightshadows.html
http://www.bbc.co.uk/schools/scienceclips/ages/7_8/light_shadows.shtml