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Why are pieces of magnesium attached to the underside of a ship?

1. To reduce the ship’s weight
2. To protect it from the effects of water and dissolved salts
3. To stop damage from rocks on the seabed
4. To keep sharks away from the vessel

Correct answer: To protect it from the effects of water and dissolved salts

Solution

Magnesium is used as a sacrificial anode on ships to prevent corrosion caused by electrolysis in seawater, effectively protecting the metal parts of the ship from damage.

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