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Salt from Seawater
Age 12 · Chemistry
When seawater evaporates, the water rises into the air as vapour. The dissolved salt stays behind and forms white crystals that can be gathered.
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In the picture
- Liquid seawater: water with dissolved salt in the basin
- Water vapour: water leaving the surface as an invisible gas
- Salt crystals: white grains forming along the basin rim
- Salt crystals: white grains settled on the basin floor
Examples
- Sea salt is made by letting shallow pools of seawater dry in the sun.
- A salty puddle on a pavement leaves a white salty ring after the water dries.
Key takeaways
- Evaporation removes water but leaves dissolved salt behind.
- The leftover salt can build up into solid crystals.
Quiz: Salt from Seawater (Age 12)
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When seawater evaporates, what happens to the water?
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What happens to the dissolved salt when the water evaporates?
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What can the salt left behind form?
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