why, does water when kept in the freezer a while , then taken out, (turn to slush, before your very eyes)?

Answer 1

The water is standing still in the freezer is supercooled below the freezing point, at least in some portions. There is no crystal or other "seed" for the crystals of ice to form. When the water is taken out, those portions below freezing get disturbed slightly and a flood of small crystals forms.