The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it.
What happens to the density of this air as it cools and how does it move?
1 )
density of the air:decreases / movement of the air:moves down
2 )
density of the air:decreases / movement of the air:stays where it is
density of the air:increases / movement of the air:moves down
4 )
density of the air:increases / movement of the air:stays where it is
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