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Three of the following favour the sinking of surface water. Which is the odd one out?

  • A.high evaporation raising the salinity
  • B.heavy rainfall freshening the surface
  • C.strong cooling at the surface
  • D.brine rejection during sea ice formation

Answer: B

Freshening lowers the density and opposes sinking, while the other three all raise it. The balance between them is what determines where deep water can form. Freshening opposes sinking. Cooling, evaporation and ice formation all raise density.

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