What is the role of density changes in a convection cycle?

Question

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2 points
It does not play a roll in convection.
As density of the water increases it moves to the top of the bin.
As density of the water decreases it moves to the top of the bin.
As density of the water decreases it moves to the bottom of the bin.

Answer 1

As density of the water decreases it moves to the bottom of the bin.