why frozen lakes seem to unfreeze from the bottom up. I know the top freezes over first because of density but why does the I’ve seem to simply get thinner while it unfreezes rather than having a pool of water over the ice. Go easy if it sounds like a dumb question.
In: 9
Ice become porous from sublimation and heat melting and from everyday life you know that water will find a way no matter how thick and solids objects looks. Ice floating on water and water just goes down. Moreover lake ice have a lot imperfections (trapped bubbles, vegetation) and since warm water expands it breaks ice from below .
Dont forget that waves from open parts in big lakes goes under ice and add fractures. I once witnessed cracks on Saima at -30 with ice feet thick. Very loud thin cracks that becomes immidiately solid.
However In some cases a sudden heatwave after cold weather could create a pond on ice.
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