How does the pressure at a certain depth in sea water differ from that at the same depth in river water ? Explain your answer.

The pressure at a certain depth in sea water is more than the same depth in river water because the density of sea water is more than the density of river water.

According to the formula,

Pressure = depth x density of liquid x acceleration due to gravity = h ρ g

Therefore, when density of a liquid is more then the pressure exerted is also more as density and pressure are directly proportional.