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

Keep away the sharks

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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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Solution

The correct option is C
Prevent action of water and salt

Magnesium provides cathodic protection and prevents rusting or corrosion thus preventing the action of water and salt.

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

The correct option is C Prevent action of water and salt Magnesium provides cathodic protection and prevents rusting or corrosion thus preventing the action of water and salt.

The correct option is C
Prevent action of water and salt

Magnesium provides cathodic protection and prevents rusting or corrosion thus preventing the action of water and salt.