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| Revison Crossword on Atoms and Solutions | |||
| What happens when you add a small crystal (known as a 'seed') to a super-saturated solution? | YouTube. 3 mins | 5 Star | |
| Sort-of an explanation here | YouTube. 2 mins | 4 Star | |
| Now can you see how these handwarmers work? | YouTube. 1 mins | 4 Star | |
| Nice simulation on concentration of solutions | From Phet | 3 Star | |
| Growing crystals | A nice variation - put in a small stone to act as a seed and a mount. YouTube. 1 min | 3 Star | |
| Check-out the biggest crystals in the world | YouTube 10 mins | 4 Star |
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| Much shorter version | From the BBC series How the Earth made us. YouTube. 1 min | 4 Star |