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More water on TOP of you.
The top of the water will freeze first because it is in direct contact with the air, the bottom will always remain ice free because it is thermally protected against the cold under the ice sheet, (so the fish tell me...) this is why fish will lie at the bottom in cold snaps... if the air temperature is cold enough for a considerable length of time it will eventually freeze completely.
On the Fahrenheit scale. Water freezes at zero on the Celsius scale.
Water freezes at 32 degrees Fahrenheit and 0 degrees Centigrade
Numerator on top; denominator on the bottom.