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Freighters produce much of the underwater noise in the Salish Sea. These ships don't have to make as much noise as they do. Engine and propeller noise can both be reduced. In fact, some naval vessels are designed to be extremely quiet. Despite this, little effort has been made to reduce engine and propeller noise.

Why do you think this is the case?

Answer :

Final answer:

Little effort has been made to reduce engine and propeller noise in freighters due to practical and environmental challenges. Alternative propulsion systems can be noisy and have other negative effects, making them less viable options.

Explanation:

The main reason little effort has been made to reduce engine and propeller noise in freighters is because it is not very practical or feasible to do so. There are various challenges in reducing noise in marine environments, such as the difficulty of maintaining moving parts in underwater structures and the potential negative impact on marine life. For example, some alternative propulsion systems like magnetohydrodynamic drives are not only noisy but also leave detectable trails and cause corrosion of metal parts.

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