The diagram shows a convection current caused by a piece of ice placed in a beaker of water at room temperature.
Which row correctly compares the temperatures and densities at water points P and Q?
1 )
temperature at P:higher than at Q / density at P:higher than at Q
2 )
temperature at P:higher than at Q / density at P:lower than at Q
temperature at P:lower than at Q / density at P:higher than at Q
4 )
temperature at P:lower than at Q / density at P:lower than at Q
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