(i) Lakes freeze from top towards bottom.
(ii) Ice floats on water.
(i) The density of ice is less than water. Coldwater starts expanding and becomes less dense than what it should be when the temperature drops to 4°C. As a result, cold
water being less dense floats on to the surface and when it comes to the chilly freezing weather conditions outside, it gets frozen.
(ii) the density of ice is lower than water and hence ice floats on water.