Question

A ship dips to a larger depth in fresh water as compared to marine water

Answer 1

as because the fresh water don't have impurities or garbage to oppose the flow of ships

Answer 2

A ship dips more in fresh water than in marine water because marine water is salty and provides more buoyancy to the ship.

EXPLANATION:

Anything floats higher in dense water than in fresh water.  

Marine water is denser than fresh water and therefore the ship displaces less volume of water as compared to when it displaces fresh water. In fresh water, the ship does not get much buoyancy and so sinks deeper.