Some useful resources for KS2 children.
Year 5 and Year 6 - science resources
https://www.bbc.com/bitesize/topics/zj44jxs
Year 4 - history resources linked to your topic work.
https://www.bbc.com/teach/class-clips-video/history-ks2-ks3-viking-invaders-and-settlers/zj9jxyc