I need help with this hw...its but density!?

Question

Does the density of water change as it goes through phases?

Why is the fact that ice floats vital to life on earth?

Answer 1

you also could ask this under homework help which is a subcategory education and reference i think

Answer 2

as far as i know density does change

well the only reason i can think of why ice is vital for earth that it float is that the glaciers that we have it they were to melt the water would over flow land.

=D

Answer 3

If ice wouldn't float, the North Pole would sink, making the water height rise. A lot.

I'm sure the density changes, yes.