ما الخاصية التي تجعل الجليد يطفو على سطح الماء وما أهمية ذلك للكائنات الحية التي تعيش في مياه المناطق الباردة

The ice floats on the surface of the water due to its buoyancy force, as the density of water is greater than the density of ice. This is important for living organisms in the water such as fish, as if the ice did not float on the water, the majority of marine organisms would die due to the ice.