Seawater is denser than river water. The pressure above the free surface of river water will be the pressure above the free surface of seawater.

higher than

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lower than

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equal to

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Solution

The correct option is C equal to
The pressure exerted by the weight of the air is known as atmospheric pressure. Only air is exerting pressure above the surfaces of both river water and seawater. Therefore, on the surfaces of river water and seawater, the pressure is equal to that of the atmospheric pressure.

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