Question

One of the many unique properties of water is that its solid form (ice) is less dense than its liquid form. Most substances become more dense when in solid form, because their molecules are more tightly compact. Why is this property of water so important to life on Earth?

Answer 1

Because it helps preserve things like planks to not get too hot and maintain it's ideal temperature

Answer 2

surface water freezes and insulates the water below for marine life.