Density

First I googled the density of fresh water at 20 degrees celcius and got 998.21Kg/cubic metre
I changed the Kg to grams and the 1cubic metre to cubic cm and did the division.
If the density of the material is greater than water it will sink, if less then it will float.
that's my logic anyway.

get back to me if you want more help or to check you answer against mine.

That makes sense. So the styrofoam and ice would somewhat float? And what the bone? Would it just be an in-betweener (not rock-bottom but doesn't float)?

would a bone in water and room temperature sink?

http://answers.yahoo.com/question/index?qid=20060610130653AAvt0DM

I googled it because I don't have a spare bone lying about to check for real. That is what the link above is.

The bone density is 1.7g/cm ³,
The water density is 1g/cm ³, (to 1 or even 2 significant figures : 0.99821)
the bone is quite a lot denser than water so normally I think it would sink.
It can only float is it is the right shape to promote bouyancy.
The articals I read said that human bones do float but I think they may have been refering to salt water which is denser.

I just had a thought, bones are not solid.
Maybe old bones are hollow, I am not sure.
If 1.7 is the density of the bone part and does not include the middle then a full bone may well be able to float.

THANK YOU!!!! That was very helpful