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Question
Several blocks of magnesium are fixed to the bottom of a ship to
Options:
A .  Keep away the sharks
B .  Make the ship lighter
C .  Prevent action of water and salt
D .  Prevent puncturing by under-sea rocks
Answer: Option C
:
C
Magnesium provides cathodic protection and prevents rusting or corrosion thus preventing the action of water and salt.

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