In a pond, the pressure at the surface at point A is P1 and at another point B, which is h meter below A is P 2. Which of the following statements holds true?
The pressure P1 at a certain depth in river water and P2 at the same depth in sea water are related as : (a) P1>P2 (b) P1=P2 (c) P1<P2 (d) P1−P2 = atmospheric pressure