Because the boat has a special shape that makes it less dense than water.
Big heavy steel ships can float on water because of a principle called buoyancy. The weight of the water displaced by the ship is greater than the weight of the ship itself, causing it to float. The shape of the ship's hull also plays a role in distributing the weight evenly, allowing it to stay afloat.
Marbles float due to their low density relative to water, while ships float because of their shape and the principle of buoyancy. The shape of ships allows them to displace a large volume of water, which creates an upward buoyant force that supports their weight.
Big metal ships are designed with a specific shape and structure that displaces enough water to generate buoyancy, which allows them to float. The weight of the ship is spread out over a large enough area, preventing it from sinking. The principle of buoyancy, based on Archimedes' principle, explains why objects float or sink in a fluid.
Because big density is to heavy.
The size of the boat is equal to the water displaced by the boat. This means, if the boat is bigger then its weight, the boat will float. If the boat is smaller than its weight, it sinks. This is why metal ships are so big.
Objects denser than water will sink; objects less dense than water will float. Since aluminum metal has a density of around 2.7 grams per cubic centimeter and water has a density of 1.0, a solid block of aluminum would sink.
Shipbuilders chose coastal locations because ships are too heavy and big to be carried to their home in the water by any other means. The ships are mostly built on a framework on land and then slid right into the water.
I think you've shortened your question a bit too much for clarity. Why heavy ships are still able to float is often explained by saying that they are able to push away enough water to equal their own weight. It's all down to OVERALL density. Things that have a higher density than water sinks, and things that have a lower density than water floats. Now, water has no clue to the density of the material, it can only react to the overall density of the complete item. So if you take a heavy material, but turn it into a big, thin-walled container, the overall density of that container can still be less than that of water, and the contaienr will float.
it will get a big storm
That would be Saturn, since it lacks in density it would be light enough to float in an ocean big enough for it.
Float.
Big containers float in water because their density is less than the density of water. The buoyant force pushing up on the container is greater than the weight of the container pushing down, so it floats. This is based on Archimedes' principle.