Question

If we freeze water then it becomes ice/ice cube.
So if we put an ice cube in a freezer why does its base starts to create
ice again?

Answer 1

Water is one of those rare materials that expands while it freezes. If a crust of ice with a small hole in it forms over liquid water, it can trap the liquid below, leaving it no room to expand during freezing. So, as the water begins to solidify, it is forced up through the hole and begins to freeze around the hole's edge, forming a hollow, water-filled spike.

Answer 2

it's base starts to create ice again because the water vapor in the air gets condensed and sticks to the ice and freezes. that is the reason why ice cubes create ice again.
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