The property of water most supports the temperature of marine environments underneath ice is the high specific heat capacity of water.
The term specific heat capacity refers to the temperature that is required to raise the temperature of 1 g of a substances by 1K. we know that water has a high specific heat capacity hence it is neither heated nor cools rapidly.
It the follows that, the property of water most supports the temperature of marine environments underneath ice is the high specific heat capacity of water.
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