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Give reasons:
(i) Lakes freeze from the top towards the bottom.
(ii) Ice floats on water.
Answers (1)
- The lake freezes from top to bottom because the temperature during winter keeps on decreasing, and the movement of water happens in such a way that the cold water is heavier and so it sinks to the bottom. While warm water replaces it by coming on the surface. The process repeats until the temperature decreases below 4 degrees and the lake keep on freezing from top to bottom.
- Density of ice is less than water due to its structure which forms empty spaces between the water molecules, 4 atoms of Hydrogen surround 1 of oxygen, and therefore make ice float on water.
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