Third week

So far this week I have learned about water molecules. It doesn't sound like much at first but it's actually really important. Without water, life on earth would not be possible. Water is a peculiar liquid, its solid form is less dense than its liquid form. Every other element's solid form is denser than its liquid form. If water behaved normally, lakes or ponds would be frozen solid, instead of just the first few feet. If that were so, multiple species would parish. Fortunately, that is not the case.