The density $\rho $ of water of bulk modulus $B $ at a depth y in the ocean is related to the density at surface ${\rho _0}$ by the relation
  • A$\rho = {\rho _0}\left[ {1 - \frac{{{\rho _0}gy}}{B}} \right]$
  • B$\rho = {\rho _0}\left[ {1 + \frac{{{\rho _0}gy}}{B}} \right]$
  • C$\rho = {\rho _0}\left[ {1 + \frac{{\rm B}}{{{\rho _0}hgy}}} \right]$
  • D$\rho = {\rho _0}\left[ {1 - \frac{B}{{{\rho _0}gy}}} \right]$
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