This website covers all areas of the Primary curriculum for science. There are lots of activity ideas to reinforce work done in the classroom
Covers all areas of the primary curriculum for science. Fun interactive resources for children in key stage 1 and 2
BBC science clips website. Plenty to do here, with online activities and then revision tests, applicable all the way up to year 6 SAT level.
The Natural Worlds web site
For those that are interested, a factual website dealing with the extinct Thylacine. The language may be quite scientific, but there are some lovely photographs to look at