Question

A part of ship's iron part has to be replaced every year. write the reason for this.

Answer 1

Answer:

because it rusts due to come in contact with aur n water

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Answer 2

Iron rust when it comes in contact with water and this process becomes faster in case of salty water.

Since ship remains in sea/ocean so the iron parts of it gets rusted.

Therefore ship's iron part has to be replaced every year for ship to safely move in water.