Materials

These are just some of the sites which might help you to get started. If you find others please post a comment so that they can be added to the list.
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Primary Resources

Solids, Liquids and Gases

SOS

OUP Free Picture

How Stuff Works

Colin's Coffee Conundrum

Reversible and Irreversible Change

Changing State

Gases Around Us

Solids and Liquids

Keeping Warm

Springs and magnets

Characteristics of Materials

Grouping and Changing Materials

Sorting and Using Materials

Bitesize Materials

NGfL CYMRU Science Ideas

Topic Box Science