Several blocks of magnesium are fixed to the bottom of a ship to:

make the ship lighter

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prevent action of water and salt

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prevent puncturing by under-sea rocks

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keep away the sharks

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Solution

The correct option is A make the ship lighter
Several blocks of magnesium are fixed to the bottom of a ship to. Magnesium, on account of its lightness, great affinity for oxygen and toughness is used in ship. Being a lighter element, magnesium makes the ship lighter when it is fixed to the bottom of the ship.
Hence option A is correct answer.

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