Heating and cooling materials
https://www.bbc.co.uk/bitesize/topics/zrssgk7/articles/z2cq2hv
Which material do we use?
https://www.bbc.co.uk/bitesize/topics/zrssgk7/articles/z9pgcdm
Which materials dissolve in water?
https://www.bbc.co.uk/bitesize/topics/zrssgk7/articles/zpd6hyc
What should I do with my rubbish?
https://www.bbc.co.uk/bitesize/topics/zrssgk7/articles/z9w26sg