reading #9

I read my chemistry book today.  I read about water and its three phases, solid, liquid, and gas.  Water can freeze at 0 degrees celcius but it can also become at liquid at 0 degrees celcius.  They can be doing the same thing at the same time.  I found that very interesting and I wonder how that can happen.  I also learned that ice is less dence then water that is the opposite of other substances.  That is why when a pond or lake freezes it freezes at the top first then to the bottom.  But another thing I learned was that at the bottom of the lake or pond the water is always at 4 degrees celcius.  Water is the only kind of chemical that when it is turned into a solid it is less dense