Answer
Metal is malleable; it can be shaped into an object with a large volume.
With a large volume, the object will have less density than the water and will float in it.
Work Step by Step
The hull of a boat has a volume such that the density is less than $1000\mathrm{k}\mathrm{g}/\mathrm{m}^{3}$, meaning that it will displace a weight of water equal to the weight of the hull, implying that it will float on the water.
