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Salty water is left standing in a shallow dish in the sun. What is left behind?
AThe clean water
BThe salty water
CThe solid salt
DNothing at all
Answer & Solution
Correct answer: C. The solid salt
1. The Sun warms the water and it slowly turns into water vapour.
2. The salt does not evaporate, so it cannot leave with the water.
3. Once all the water has gone, the dry solid salt remains in the dish.
4. This is how salt is collected from sea water in shallow pans.
_Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Separation by evaporation_
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