Easy Fix: Get some reeeaaallllyyy long cables and strap Guam to Greenland then both will be just fine. Everything will balance out.
Then why does an Ice cube tray expand/protrude when the full cube bin water freezes ?
And conversely why does water boil over a pan.
Damned good questions.
Well here are the answers via this Calculator
I input Temps of 40 starting and 20 finishing resulting in a change of .0986/.0014
20 starting and 40 finishing resulting in a change of .101/-.0014
The change in Volume is the same both ways.