As water cools down the H2O molecules slow down and when the temperature reaches 0 degrees Celsius the water freezes. This is because the H2O molecules slow down enough that their attractions arrange them into fixed positions, forming ice. Ice is great to add to your drink on a warm summers day.
I am just going to add to what Jake had said in his answer. Another cool about water molecules in ice is that they actually move further apart, so when you freeze water.. it expands, precisely because the actually molecules of oxygen and hydrogen move apart. This is why ice floats in water. On top of this, in order to keep the moelcules of hydrogen and oxygen together, the molecules vibrate more vigorously, than the molecules in water.
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