Definition of Salt Water
(Impact on Weather)

The thickness of seawater is an element of saltiness and temperature, Lagerloef clarified. Saltier water is heavier and will sink further in the sea, where it joins flows that course water all throughout the planet. ... Stable salt densities in the seas keep the world's environment in balance, researchers accept.

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Salt weathering or Salt Weather is a form of mechanical or physical weathering of rock. ... The salt derives from an external source (capillary rising ground water, eolian origin, sea water along rocky coasts, atmospheric pollution). Salt weathering is favoured by dry conditions, such as are found in warm and cold (arctic) arid climates.

Explanation:

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well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."