Comment Likely Partial Answer: UV (Score 1) 304
If it floats in water, it is going to get hit by perpetual exposure to UV radiation.
The same way sailors get sun burnt very quickly. UV gets reflected by water, enlarging the exposure. UV tears apart molecular bonds, which is why, for example, the ozone layer is so important.
The same way sailors get sun burnt very quickly. UV gets reflected by water, enlarging the exposure. UV tears apart molecular bonds, which is why, for example, the ozone layer is so important.