It will sink in the water.
When it has less specific gravity than water, what will it do?
It will float on the surface of the water.
Will all parts of the body be above the surface of the water?
No; a part of it will sink into the water.
How much of it will sink into the water?
It will sink so as to displace water enough to balance its own weight.
Why does a boat float on the water?
Because it weighs less than a bulk of water of the same size as the boat.
When a cargo is placed on the boat, why does it still float?