Question

Explain Briefly Why Water Tanks(Ocean) Starts Freezing From Top Not From The Bottom.

Answer 1

When water freezes, it gets less dense. That is why ice cubes float in a glass of water. It also takes a lot of energy removal to freeze water, and the air is usually much colder than the earth at thebottom of the lake. So the cold comes from the air above the lake, and starts freezing thewater from the surface.